Exhibit 99.3

Miller And Lents, Ltd.
INTERNATIONAL OIL AND GAS CONSULTANTS
TWENTY-SEVENTH FLOOR
IIOO LOUISIANA
HOUSTON, TEXAS 77OO2-5216
Telephone 713-651-9455
Telefax 713-654-9914
e-mail: mail@millerandlents.com

January 12, 2006

Mr. Ron E. Hooper
Senior Vice President
Bank of America, N.A., Trustee
Williams Coal Seam Gas Royalty Trust
901 Main Street, Suite 1700
Dallas, Texas 75201

Re:	Proved Reserves and Future Net
	Revenues As of December 31, 2005

Dear Mr. Hooper:

     At your request, we estimated the proved reserves and projected the future net revenues from the gas reserves in the Fruitland Coal Formation that are attributable to the subject interests of the Williams Coal Seam Gas Royalty Trust (“WTU”). These interests consist of net profits interests in natural gas properties located in the San Juan Basin in Colorado and New Mexico.

     A summary of the reserves for the Underlying Properties and Royalty Interests (net to the Trust) is as follows:

	Net Gas		Future Net		Present Value
	Reserves,		Revenues,		at 10 Percent
	MMcf		M$		Per Annum, M$
The Underlying Properties
Proved Developed		85,670		370,113		261,245
Proved Undeveloped		12,078		38,217		21,401
Total Proved		97,748		408,330		282,646
The Royalty Interests (Net to the Trust)
Proved Developed		27,710		90,134		53,234
Proved Undeveloped		897		3,479		1,463
Total Proved		28,606		93,613		54,697

Miller and Lents, Ltd.

Mr. Ron E. Hooper	January 12, 2006
Bank of America, N.A., Trustee	Page 2
Williams Coal Seam Gas Royalty Trust

     In order to estimate the reserves to the WTU, it was necessary to estimate the reserves attributable to (i) the “Underlying Properties,” which are certain working interest properties (“Working Interest Properties”) and net profits interests properties (“Farmout Properties”) that are managed by Williams Production Company (“WPC”) and (ii) the “Royalty Interests,” the variable net revenue interest conveyed to WTU by WPC. WTU receives a “Specified Percentage” of “Net Proceeds” from gas produced and sold from the Working Interest Properties and from the revenue stream of the Farmout Properties. Currently, for 320-acre spaced wells in the Working Interest Properties, and all wells in the Farmout Properties, the percentage of net proceeds is 60 percent.

     For the Working Interest Properties, overhead costs (beyond the standard overhead charges for the non-operated properties) have not been included, nor have the effects of depreciation, depletion, and Federal Income Tax. Net Proceeds is defined as revenues derived from the sale of Working Interest Properties gas volumes less severance and ad valorem taxes, lease royalty payments, and operating expenses in excess of the estimates shown in Exhibit B of the Trust Conveyance. The reserves attributable to the Royalty Interests from the Working Interest Properties were computed by multiplying the net gas reserves of the Working Interest Properties by the ratio of (i) the net revenue received by WTU from the Working Interest Properties to (ii) total revenues from the Working Interest Properties after deduction of severance and ad valorem taxes.

     The proved reserves were estimated in accordance with the definitions contained in Securities and Exchange Commission Regulation S-X, Rule 4-10(a). Estimates of future net revenues and discounted future net revenues are not intended and should not be interpreted to represent the fair market value of the estimated reserves.

     The production forecast for the total proved reserves and future net revenues as of December 31, 2005 attributable to the Underlying Properties and to the WTU are shown on Table 1. Forecasts for proved developed reserves and proved undeveloped reserves are shown on Tables 2 and 3. The proved reserves and future net revenues as of December 31, 2005 attributable to the individual Underlying Properties are shown on the attached one-line summary identified as Table 4.

     The gas reserves for the Fruitland Coal were primarily estimated by decline curve analyses utilizing type curves for the various areas in the San Juan Basin. These type curves were developed for each area and were based on production histories and the initial reservoir pressures of the wells in the separate areas.

     In October 2002, the field rules for the Basin Fruitland Coal Gas Pool in New Mexico were revised to allow an optional second (infill) well on the standard 320-acre spacing unit in certain designated areas of the pool. As of July 2003, the field rules were further modified to allow such infill drilling in all areas of the pool. The Working Interest Properties contain 530 infill locations of which 316 have been drilled and 214 additional locations are evaluated as containing proved undeveloped reserves. The Trust provides for an infill NPI, a net profits interest that entitles the Trust to receive 20 percent of the Infill Net Proceeds. Infill Net Proceeds is determined on an aggregate basis, not on a well-by-well basis.

Miller and Lents, Ltd.

Mr. Ron E. Hooper	January 12, 2006
Bank of America, N.A., Trustee	Page 3
Williams Coal Seam Gas Royalty Trust

     The gas prices and deductions for WTU are based upon information provided by WPC. The gas price for the Farmout Properties is $7.560 per MMBtu based on the December 31, 2005 Blanco Hub Index Price. For the Working Interest Properties, the adjusted price of $4.780 per MMBtu was employed as provided for in the Gas Purchase Contract. On December 31, 2012, the WTU terminates and the Gas Purchase Contract is no longer in effect. The gas price reverts to $7.560 per MMBtu, based on the December 31, 2005 Blanco Hub Index Price. Gathering and transportation charges, taxes, treating, and other costs payable prior to the delivery points were deducted from the index price in order to determine the net wellhead price used in this evaluation. These prices and deductions were held constant.

     Deductions for lease royalty and production and ad valorem taxes for the Working Interest Properties were based on the December 31, 2005 index gas price of $7.560 per MMBtu less appropriate deductions as reported by WPC.

     Operating expense estimates were based on expenses incurred during 2005 and were not escalated. Where appropriate, estimated operating expenses which exceeded the operating expenses in Exhibit B to the Conveyance were deducted in calculating Net Proceeds and, therefore, reduced the amounts payable to the WTU.

     In preparation of our estimates, we relied on production histories, accounting and cost data, engineering and geological information supplied by WPC, and data from public records. The ownership interests evaluated herein were provided by WPC and were employed as presented. No independent verification of these interests was made by Miller and Lents, Ltd.

     Capital expenditures to plug and abandon wells are considered to be equal to the salvage values of the wells at the time of abandonment. We did not include any consideration for the future environmental restoration that might be required as such was beyond the scope of our assignment. In our projection of future net revenues, no provisions are made for production prepayments or for the consequences of future production balancing. As instructed, we assumed for purposes of this report that the Trust will continue as long as there is economic production from the contributing properties.

     The evaluations presented in this report, with the exceptions of those parameters specified by others, reflect our informed judgments based on accepted standards of professional investigation but are subject to those generally recognized uncertainties associated with interpretation of geological and engineering information. Government policies and market conditions different from those employed in this study may cause the total quantity of oil or gas to be recovered, actual production rates, prices received, and operating and capital costs to vary from those presented in this report. Minor precision inconsistencies in subtotals or totals may exist in the report due to truncation or rounding of aggregated values.

     Miller and Lents, Ltd. is an independent oil and gas consulting firm. No director, officer, or key employee of Miller and Lents, Ltd. has any financial ownership in WTU or WPC or any related company. Our compensation for the required investigations and preparation of this report is not

Miller and Lents, Ltd.

Mr. Ron E. Hooper	January 12, 2006
Bank of America, N.A., Trustee	Page 4
Williams Coal Seam Gas Royalty Trust

contingent on the results obtained and reported, and we nave not performed other work that would affect our objectivity. Production of this report was supervised by an officer of the firm who is a professionally qualified and licensed Professional Engineer in the State of Texas with more than 20 years of relevant experience in the estimation, assessment, and evaluation of oil and gas reserves.

Very truly yours,
MILLER AND LENTS, LTD.
By	/s/ Stephen M. Hamburg
	Stephen M. Hamburg
	Vice President

SMH/hsd  [SEAL] 

WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMICS AS OF DECEMBER 31, 2005
UNDERLYING PROPERTIES AND TRUST INTERESTS

NON-ESCALATED 12/31/2005 PRICES
TOTAL PROVED RESERVES

	Underlying Properties																				Trust Interests
	Natural Gas, MMCF						Revenue				Net Oper Costs, M$				Future Net Revenue, M$				Tax Credits, M$				Future Net Revenue, M$				Tax Credits, M$
					Price		to Net Intr		Oper		Adv&Sev		Future				Disc			Disc	Net				Disc			Disc
Year	Gross		Net		$/Mcf		M$		Expns		Taxes		Capital		Annual		@10%		Annual	@10%	MMCF		Annual		@10%		Annual	@10%
2006		209,441		17,866		5.404		96,555		6,875		10,106		5,658		73,916		70,630				4,569		11,997		11,434
2007		175,722		14,886		5.407		80,490		5,937		8,439		2,605		63,509		55,135				4,021		10,450		9,025
2008		146,600		12,315		5.409		66,607		5,119		6,992		3,413		51,084		40,310				3,176		8,280		6,481
2009		120,790		10,155		5.410		54,942		4,423		5,772		982		43,765		31,382				2,729		7,067		5,012
2010		100,154		8,382		5.411		45,358		3,846		4,769		1,567		35,176		22,929				2,127		5,536		3,558
2011		80,325		6,704		5.410		36,264		3,271		3,809		20		29,165		17,278				1,848		4,774		2,780
2012		63,258		5,342		5.408		28,886		2,789		3,030		—		23,067		12,424				1,483		3,837		2,025
2013		50,165		4,277		5.406		23,120		2,388		2,422		—		18,310		8,966				1,703		8,206		3,903
2014		40,165		3,448		5.405		18,638		2,083		1,951		—		14,604		6,501				1,375		6,626		2,854
2015		32,310		2,789		5.404		15,070		1,828		1,577		—		11,665		4,721				1,112		5,355		2,089
2016		26,151		2,265		5.403		12,239		1,624		1,280		—		9,335		3,435				900		4,333		1,531
2017		21,247		1,845		5.403		9,968		1,454		1,042		—		7,472		2,500				728		3,506		1,122
2018		17,310		1,505		5.402		8,132		1,307		850		—		5,975		1,817				589		2,834		821
2019		14,117		1,229		5.402		6,637		1,178		693		—		4,765		1,317				475		2,286		600
2020		11,501		1,002		5.401		5,411		1,060		565		—		3,786		953				382		1,839		438
2021		9,303		809		5.401		4,366		926		456		—		2,985		682				306		1,470		317
2022		7,360		642		5.399		3,466		786		361		—		2,318		481				243		1,167		228
2023		5,846		510		5.401		2,754		679		288		—		1,787		339				191		918		162
2024		4,602		403		5.399		2,173		577		227		—		1,370		235				150		722		115
2025		3,558		312		5.397		1,686		472		176		—		1,038		164				117		560		81
AFTER		11,917		1,065		5.405		5,756		1,920		598		—		3,237		446				384		1,849		122
TOTAL		1,151,842		97,748		5.407		528,517		50,540		55,402		14,244		408,330		282,646				28,606		93,613		54,697

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 1

WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMICS AS OF DECEMBER 31, 2005
UNDERLYING PROPERTIES AND TRUST INTERESTS

NON-ESCALATED 12/31/2005 PRICES
TOTAL PROVED DEVELOPED RESERVES

	Underlying Properties																				Trust Interests
	Natural Gas, MMCF						Revenue		Net Oper Costs, M$						Future Net Revenue, M$				Tax Credits, M$				Future Net Revenue, M$				Tax Credits, M$
					Price		to Net Intr		Oper		Adv&Sev		Future				Disc			Disc	Net				Disc			Disc
Year	Gross		Net		$/Mcf		M$		Expns		Taxes		Capital		Annual		@10%		Annual	@10%	MMCF		Annual		@10%		Annual	@10%
2006		199,539		17,173		5.401		92,747		6,592		9,683		—		76,472		73,057				4,569		11,997		11,434
2007		157,081		13,508		5.398		72,914		5,359		7,597		—		59,958		52,070				4,021		10,450		9,025
2008		124,487		10,699		5.396		57,725		4,420		6,004		—		47,300		37,341				3,163		8,251		6,458
2009		99,778		8,572		5.394		46,241		3,712		4,805		—		37,724		27,073				2,633		6,849		4,858
2010		79,893		6,861		5.393		36,997		3,136		3,840		—		30,021		19,586				2,119		5,519		3,548
2011		64,136		5,509		5.391		29,699		2,675		3,079		—		23,945		14,202				1,715		4,471		2,604
2012		51,623		4,436		5.390		23,911		2,298		2,477		—		19,136		10,318				1,385		3,615		1,909
2013		41,696		3,585		5.389		19,318		1,993		2,000		—		15,325		7,512				1,576		7,586		3,609
2014		33,809		2,908		5.388		15,669		1,754		1,621		—		12,294		5,478				1,278		6,148		2,649
2015		27,463		2,365		5.387		12,739		1,556		1,317		—		9,865		3,996				1,036		4,985		1,945
2016		22,366		1,927		5.387		10,383		1,394		1,073		—		7,916		2,915				840		4,042		1,428
2017		18,246		1,573		5.387		8,470		1,251		875		—		6,344		2,125				681		3,275		1,049
2018		14,884		1,284		5.386		6,915		1,123		714		—		5,077		1,546				551		2,650		768
2019		12,141		1,048		5.386		5,647		1,009		583		—		4,054		1,122				445		2,142		562
2020		9,900		856		5.385		4,608		903		476		—		3,229		813				359		1,726		411
2021		8,004		690		5.384		3,715		780		383		—		2,552		584				288		1,382		298
2022		6,377		550		5.383		2,960		658		305		—		1,997		415				229		1,102		215
2023		5,158		446		5.387		2,400		582		248		—		1,569		298				182		874		154
2024		4,163		360		5.388		1,941		509		201		—		1,231		211				144		693		111
2025		3,283		285		5.386		1,537		427		159		—		952		150				113		544		79
AFTER		11,618		1,037		5.403		5,601		1,867		581		—		3,152		434				381		1,833		119
TOTAL		995,644		85,670		5.394		462,136		43,999		48,024		—		370,113		261,245				27,710		90,134		53,234

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 2

WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMICS AS OF DECEMBER 31, 2005
UNDERLYING PROPERTIES AND TRUST INTERESTS

NON-ESCALATED 12/31/2005 PRICES
TOTAL PROVED UNDEVELOPED RESERVES

	Underlying Properties																								Trust Interests
	Natural Gas, MMCF						Revenue		Net Oper Costs, M$						Future Net Revenue, M$						Tax Credits, M$				Future Net Revenue, M$				Tax Credits, M$
					Price		to Net Intr		Oper		Adv&Sev		Future					Disc				Disc	Net				Disc			Disc
Year	Gross		Net		$/Mcf		M$		Expns		Taxes		Capital		Annual			@10%			Annual	@10%	MMCF		Annual		@10%		Annual	@10%
2006		9,901		693		5.496		3,809		283		423		5,658		(2,556	)		(2,427	)				—		—		—
2007		18,641		1,379		5.496		7,577		578		842		2,605		3,551			3,065					—		—		—
2008		22,114		1,616		5.496		8,883		699		987		3,413		3,784			2,969					13		29		23
2009		21,012		1,583		5.496		8,701		711		967		982		6,042			4,310					96		218		154
2010		20,261		1,521		5.496		8,361		709		929		1,567		5,156			3,343					7		17		11
2011		16,189		1,195		5.496		6,565		596		730		20		5,219			3,077					133		303		175
2012		11,635		905		5.496		4,975		491		553		—		3,931			2,107					97		222		116
2013		8,469		692		5.496		3,803		395		423		—		2,984			1,454					127		620		294
2014		6,356		540		5.496		2,969		329		330		—		2,310			1,023					98		478		205
2015		4,847		424		5.495		2,331		272		259		—		1,800			725					76		371		144
2016		3,785		338		5.495		1,856		230		206		—		1,420			520					60		291		102
2017		3,001		272		5.496		1,497		203		166		—		1,128			375					47		230		73
2018		2,426		222		5.495		1,217		184		135		—		898			272					37		183		53
2019		1,977		180		5.498		990		169		110		—		711			195					30		145		38
2020		1,601		146		5.494		803		156		89		—		557			140					23		114		27
2021		1,299		119		5.495		651		145		72		—		434			99					18		88		19
2022		983		92		5.495		506		128		56		—		322			66					13		65		13
2023		688		64		5.498		354		96		39		—		218			41					9		44		7
2024		439		42		5.493		232		67		26		—		139			24					6		28		4
2025		276		27		5.507		149		46		17		—		86			14					3		17		3
AFTER		299		28		5.496		155		53		17		—		85			12					3		16		2
TOTAL		156,198		12,078		5.496		66,381		6,541		7,379		14,244		38,217			21,401					897		3,479		1,463

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 3

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

												REVENUE		OPER.						BFIT NET		10% DISC
						LIFE		GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS		MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
STATE: COLORADO
PROVED DEVELOPED RESERVES
HENDRICKSON GU B #1 (NPI)	13385	NON-UNIT	32N10W20		1		22		1,319		404		1,726		0		0		0		1,726		1,178		12
SO UTE TRIBAL I 2 (NPI)	13389	NON-UNIT	32N10W07		1		17		1,262		386		1,652		0		0		0		1,652		1,228		17
SO UTE TRIBAL J #2 (NPI)	13390	NON-UNIT	32N10W07		1		21		999		306		1,307		0		0		0		1,307		889		22
TOTAL PROVED DEVELOPED: 160-Acre Colorado					3				3,579		1,096		4,685		0		0		0		4,685		3,295
CARTER UTE #101 (NPI)	14449	NON-UNIT	32N10W12		1		21		1,726		66		282		0		0		0		282		200		6
CARTER UTE #106 (NPI)	13397	NON-UNIT	32N10W11		1		22		2,253		173		737		0		0		0		737		520		16
CARTER UTE #107(NPI)	13398	NON-UNIT	32N10W13		1		13		702		67		287		0		0		0		287		223		14
CLARK CUMMINS GU A #1 (NPI)	13383	NON-UNIT	32N10W19		1		31		2,639		798		3,412		0		0		0		3,412		2,126		13
HENDRICKSON GU A #1 (NPI)	13384	NON-UNIT	32N10W20		1		15		614		186		794		0		0		0		794		584		11
J B GARDNER GU A #1 (NPI)	13386	NON-UNIT	32N10W22		1		25		2,315		481		2,055		0		0		0		2,055		1,399		18
MONTGOMERY, M H #9 (NPI)	15248	NON-UNIT	32N10W12		1		28		3,543		678		2,899		0		0		0		2,899		1,928		15
ROBIN FRAZIER GU A #1 (NPI)	13387	NON-UNIT	32N10W23		1		17		1,137		226		965		0		0		0		965		715		19
SO UTE 10-3, 32-10 (NPI)	13399	NON-UNIT	32N10W10		1		25		2,564		393		1,678		0		0		0		1,678		1,151		21
SO UTE 15-3, 32-10 (NPI)	13400	NON-UNIT	32N10W15		1		32		3,459		265		1,132		0		0		0		1,132		711		9
SO UTE 16-2, 32-10 (NPI)	13401	NON-UNIT	32N10W16		1		22		2,153		247		1,057		0		0		0		1,057		746		10
SO UTE TRIBAL H #2 (NPI)	13388	NON-UNIT	32N10W18		1		18		972		298		1,272		0		0		0		1,272		915		2
SO UTE TRIBAL KK #1 (NPI)	13391	NON-UNIT	32N10W07		1		20		888		272		1,163		0		0		0		1,163		791		3
SO UTE TRIBAL LL #1 (NPI)	13392	NON-UNIT	32N10W08		1		19		1,118		342		1,464		0		0		0		1,464		1,041		4
SO UTE TRIBAL MM #1 (NPI)	13393	NON-UNIT	32N10W08		1		23		1,558		477		2,040		0		0		0		2,040		1,392		7
SO UTE TRIBAL NN #1 (NPI)	13394	NON-UNIT	32N10W17		1		17		919		281		1,203		0		0		0		1,203		876		5
SO UTE TRIBAL OO #1 (NPI)	13395	NON-UNIT	32N10W18		1		16		688		211		900		0		0		0		900		651		8
SO UTE TRIBAL SS #1 (NPI)	13396	NON-UNIT	32N10W21		1		23		1,555		476		2,036		0		0		0		2,036		1,368		20
TOTAL PROVED DEVELOPED: 320-Acre Colorado					18				30,803		5,936		25,377		0		0		0		25,377		17,337
TOTAL PROVED DEVELOPED: COLORADO					21				34,382		7,033		30,063		0		0		0		30,063		20,632
TOTAL PROVED RESERVES: COLORADO					21				34,382		7,033		30,063		0		0		0		30,063		20,632
STATE: NEW MEXICO
PROVED DEVELOPED RESERVES
BLANCO #201A	5609	NON-UNIT	31N08W35		1		16		700		103		568		66		63		0		439		311		1168
BLANCO #202A	5607	NON-UNIT	31N08W26		1		8		319		47		258		31		29		0		199		170		1166
BLANCO #203A	5610	NON-UNIT	31N08W35		1		16		488		72		396		53		44		0		299		220		1233
BLANCO #204A	5608	NON-UNIT	31N08W26		1		12		366		54		297		41		33		0		224		175		1165
BLANCO #330S	5559	NON-UNIT	31N08W05		1		20		1,495		109		600		58		67		0		476		342		1132
DECKER GAS COM A #1S	5840	NON-UNIT	32N10W17		1		13		245		18		98		17		11		0		70		53		1133
EAGLE #750S	5995	NON-UNIT	32N09W16		1		16		665		13		69		8		8		0		54		38		1179

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 1 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

												REVENUE		OPER.						BFIT NET		10% DISC
						LIFE		GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS		MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
HUERFANO UNIT #258S	2326	HUERFANO	27N10W36		1		14		277		39		215		35		24		0		156		116		1191
HUERFANO UNIT #79	12186	HUERFANO	27N10W31		1		18		952		134		739		75		82		0		582		405		1268
MOORE, WAYNE COM #2S (BPO)	5268	NON-UNIT	31N09W16		1		9		157		8		44		8		5		0		31		25		1034
NE BLANCO UNIT #403A	5191	NEBU	30N07W09		1		16		561		4		24		3		3		0		19		14		767
NE BLANCO UNIT #406A	5192	NEBU	31N07W22		1		1		4		0		0		0		0		0		0		0		1008
NE BLANCO UNIT #407A	17895	NEBU	30N07W21		1		12		242		2		10		2		1		0		8		6		695
NE BLANCO UNIT #408A	5196	NEBU	31N07W20		1		0		0		0		0		0		0		0		0		0		1215
NE BLANCO UNIT #410A	17897	NEBU	31N07W09		1		17		1,641		13		70		5		8		0		57		44		668
NE BLANCO UNIT #413A	17899	NEBU	30N07W20		1		9		251		2		11		1		1		0		8		7		692
NE BLANCO UNIT #418A	5210	NEBU	31N07W28		1		16		1,378		11		59		5		7		0		48		36		1217
NE BLANCO UNIT #422A	5146	NEBU	31N07W20		1		10		467		4		20		2		2		0		16		13		1011
NE BLANCO UNIT #426A	5231	NEBU	31N06W06		1		19		1,160		9		50		4		6		0		40		28		1219
NE BLANCO UNIT #428A	6018	NEBU	31N07W24		1		17		1,136		9		49		4		5		0		39		28		1048
NE BLANCO UNIT #430A	5245	NEBU	30N07W05		1		17		701		5		30		3		3		0		24		17		1013
NE BLANCO UNIT #433A	1000	NEBU	30N07W19		1		15		449		3		19		2		2		0		15		11		1208
NE BLANCO UNIT #434A	6017	NEBU	31N07W23		1		7		452		4		19		2		2		0		16		14		1045
NE BLANCO UNIT #435A	4894	NEBU	30N08W01		1		21		1,626		13		70		6		8		0		56		40		999
NE BLANCO UNIT #436A	1149	NEBU	31N06W19		1		20		1,855		14		79		6		9		0		64		47		1004
NE BLANCO UNIT #437A	5251	NEBU	30N08W12		1		18		925		7		40		4		4		0		31		23		1015
NE BLANCO UNIT #438A	1160	NEBU	31N06W18		1		14		676		5		29		3		3		0		23		18		1000
NE BLANCO UNIT #440A	709	NEBU	31N07W11		1		19		1,992		16		85		7		9		0		69		51		1207
NE BLANCO UNIT #441A	1545	NEBU	30N08W24		1		15		942		7		40		4		4		0		32		25		735
NE BLANCO UNIT #442A	17900	NEBU	31N07W11		1		22		2,452		19		105		8		12		0		85		61		666
NE BLANCO UNIT #445A	5250	NEBU	31N08W25		1		14		751		6		32		3		4		0		26		20		1017
NE BLANCO UNIT #447A	5248	NEBU	31N08W36		1		15		984		8		42		4		5		0		34		26		1018
NE BLANCO UNIT #448A	5181	NEBU	31N07W32		1		12		308		2		13		2		1		0		10		8		1019
NE BLANCO UNIT #449A	5183	NEBU	31N07W19		1		19		1,580		12		68		5		8		0		55		40		1020
NE BLANCO UNIT #457A	5189	NEBU	31N07W30		1		17		1,784		14		76		6		8		0		62		47		1022
NE BLANCO UNIT #458A	5247	NEBU	31N07W13		1		13		1,474		11		63		5		7		0		51		41		1023
NE BLANCO UNIT #460A	1810	NEBU	31N06W07		1		19		1,848		14		79		6		9		0		64		48		753
NE BLANCO UNIT #462A	5246	NEBU	31N07W01		1		17		747		6		32		3		4		0		25		18		1025
NE BLANCO UNIT #463A	5170	NEBU	30N07W18		1		12		432		3		18		2		2		0		14		11		1213
NE BLANCO UNIT #464A	17898	NEBU	31N07W10		1		15		932		7		40		4		4		0		32		24		667
NE BLANCO UNIT #468A	5163	NEBU	31N07W35		1		20		1,392		11		60		5		7		0		48		34		772
NE BLANCO UNIT #478A	5212	NEBU	31N07W21		1		13		471		4		20		2		2		0		16		12		1218
NE BLANCO UNIT #480A	5209	NEBU	31N07W14		1		16		591		5		25		3		3		0		20		14		1029
NE BLANCO UNIT #482A	4895	NEBU	31N07W15		1		16		1,187		9		51		4		6		0		41		31		1002
NE BLANCO UNIT #483A	5149	NEBU	31N07W36		1		16		544		4		23		3		3		0		18		13		774
NE BLANCO UNIT #484A	4896	NEBU	31N07W16		1		16		1,347		10		58		5		6		0		47		36		1003
NE BLANCO UNIT #486A	1150	NEBU	31N06W19		1		17		1,749		14		75		6		8		0		61		46		717
NE BLANCO UNIT #487A	5201	NEBU	31N07W35		1		6		409		3		17		2		2		0		14		12		1030
NE BLANCO UNIT #490A	5198	NEBU	31N07W14		1		16		588		5		25		3		3		0		20		14		1216
NE BLANCO UNIT #491A	5147	NEBU	31N07W25		1		19		985		8		42		4		5		0		34		24		1212

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 2 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

												REVENUE		OPER.						BFIT NET		10% DISC
						LIFE		GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS		MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
NE BLANCO UNIT #492A	5795	NEBU	31N07W12		1		6		389		3		17		1		2		0		13		12		1038
NE BLANCO UNIT #495A	1068	NEBU	31N06W30		1		12		396		3		17		2		2		0		13		10		754
NE BLANCO UNIT #496A	1161	NEBU	31N06W18		1		19		1,457		11		62		5		7		0		50		36		720
NE BLANCO UNIT #497A	1110	NEBU	31N06W30		1		14		480		4		21		2		2		0		16		12		713
NE BLANCO UNIT #498A	5193	NEBU	31N07W13		1		21		1,571		12		67		6		7		0		54		39		1214
NE BLANCO UNIT #499A	1152	NEBU	31N06W20		1		19		2,558		20		109		8		12		0		89		68		731
NE BLANCO UNIT #500A	1157	NEBU	31N06W20		1		14		733		6		31		3		3		0		25		19		1209
NE BLANCO UNIT #504A	1163	NEBU	31N07W16		1		8		586		5		25		2		3		0		20		17		738
PAYNE #201S	4128	NON-UNIT	32N10W20		1		19		1,030		19		104		11		12		0		82		59		743
QUINN #336S	5596	NON-UNIT	31N08W17		1		18		952		70		384		41		43		0		300		209		1135
SAN JUAN 28-6 UNIT #418S	19353	SJ 28-6	28N06W28		1		9		90		5		28		8		3		0		17		13		639
SAN JUAN 29-6 UNIT #201A	5403	SJ 29-6	29N06W06		1		14		469		57		312		40		35		0		237		179		740
SAN JUAN 29-6 UNIT #202A	5404	SJ 29-6	29N06W06		1		6		60		7		40		11		4		0		24		20		739
SAN JUAN 29-6 UNIT #203A	5406	SJ 29-6	29N06W07		1		14		754		91		501		52		56		0		393		303		816
SAN JUAN 29-6 UNIT #204A	5405	SJ 29-6	29N06W07		1		16		567		69		377		47		42		0		288		211		745
SAN JUAN 29-6 UNIT #205A	6095	SJ 29-6	29N06W21		1		17		1,378		167		916		82		102		0		732		558		926
SAN JUAN 29-6 UNIT #207A	5555	SJ 29-6	29N06W02		1		18		966		117		642		67		71		0		504		364		817
SAN JUAN 29-6 UNIT #208A	5551	SJ 29-6	29N06W17		1		11		173		21		115		23		13		0		79		61		995
SAN JUAN 29-6 UNIT #209A	5552	SJ 29-6	29N06W17		1		12		566		69		377		41		42		0		294		234		994
SAN JUAN 29-6 UNIT #210A	6093	SJ 29-6	29N06W20		1		16		1,297		157		863		79		96		0		688		525		924
SAN JUAN 29-6 UNIT #214A	5407	SJ 29-6	29N06W03		1		18		865		105		575		62		64		0		449		325		818
SAN JUAN 29-6 UNIT #215A	5408	SJ 29-6	29N06W03		1		21		1,641		199		1,091		100		121		0		870		623		775
SAN JUAN 29-6 UNIT #216A	5410	SJ 29-6	29N06W04		1		18		940		114		625		66		69		0		489		354		742
SAN JUAN 29-6 UNIT #217A	5411	SJ 29-6	29N06W05		1		12		340		41		226		31		25		0		170		134		741
SAN JUAN 29-6 UNIT #218A	5412	SJ 29-6	29N06W05		1		2		19		2		13		3		1		0		8		8		905
SAN JUAN 29-6 UNIT #220A	6081	SJ 29-6	29N06W11		1		16		1,279		155		850		77		94		0		678		519		912
SAN JUAN 29-6 UNIT #221A	6082	SJ 29-6	29N06W11		1		13		290		35		193		31		21		0		141		105		911
SAN JUAN 29-6 UNIT #236A	5553	SJ 29-6	29N06W18		1		8		188		23		125		20		14		0		91		76		819
SAN JUAN 29-6 UNIT #237A	5110	SJ 29-6	29N06W01		1		14		368		44		244		36		27		0		182		135		757
SAN JUAN 29-6 UNIT #238A	5033	SJ 29-6	29N06W01		1		7		142		17		94		16		10		0		68		58		734
SAN JUAN 29-6 UNIT #239A	5616	SJ 29-6	29N06W02		1		16		490		59		326		43		36		0		247		182		903
SAN JUAN 29-6 UNIT #240A	6078	SJ 29-6	29N06W18		1		7		222		27		148		19		16		0		113		98		921
SAN JUAN 29-6 UNIT #241A	6091	SJ 29-6	29N06W19		1		13		1,120		136		745		66		83		0		596		479		922
SAN JUAN 29-6 UNIT #242A	5554	SJ 29-6	29N06W19		1		15		955		116		635		62		71		0		502		386		820
SAN JUAN 29-6 UNIT #245A	5413	SJ 29-6	29N06W08		1		15		467		57		311		41		35		0		235		173		776
SAN JUAN 29-6 UNIT #72A	6098	SJ 29-6	29N06W22		1		7		68		10		55		16		6		0		33		27		1241
SAN JUAN 29-7 UNIT #176	707	SJ 29-7	29N07W22		1		13		147		15		82		19		9		0		53		39		684
SAN JUAN 29-7 UNIT #187	832	SJ 29-7	29N07W03		1		3		20		2		11		4		1		0		6		5		696
SAN JUAN 29-7 UNIT #188	18165	SJ 29-7	29N07W06		1		5		34		3		19		7		2		0		10		8		748
SAN JUAN 29-7 UNIT #189	8020	SJ 29-7	29N07W14		1		11		192		126		694		122		77		0		494		382		694
SAN JUAN 29-7 UNIT #191	945	SJ 29-7	29N07W22		1		4		28		3		15		5		2		0		9		8		749
SAN JUAN 29-7 UNIT #507S	6070	SJ 29-7	29N07W13		1		16		665		67		369		41		41		0		287		203		894
SAN JUAN 29-7 UNIT #521S	6069	SJ 29-7	29N07W13		1		16		654		66		362		41		40		0		282		200		895

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 3 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

												REVENUE		OPER.						BFIT NET		10% DISC
						LIFE		GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS		MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 29-7 UNIT #545S	6068	SJ 29-7	29N07W12		1		19		1,140		115		632		61		70		0		501		360		892
SAN JUAN 29-7 UNIT #563S	1195	SJ 29-7	29N07W24		1		15		856		375		2,059		198		229		0		1,632		1,259		693
SAN JUAN 29-7 UNIT #565S	6074	29-7	29N07W26		1		16		676		444		2,440		267		271		0		1,901		1,348		1332
SAN JUAN 30-5 UNIT #201A	5722	SJ 30-5	30N05W19		1		16		717		122		672		75		75		0		523		387		969
SAN JUAN 30-5 UNIT #202A	1551	SJ 30-5	30N05W06		1		15		2,115		314		1,726		140		192		0		1,394		1,111		947
SAN JUAN 30-5 UNIT #203A	9785	SJ 30-5	30N05W06		1		19		1,832		312		1,716		148		191		0		1,378		1,023		644
SAN JUAN 30-5 UNIT #206A	5721	SJ 30-5	30N05W18		1		14		312		53		293		46		33		0		215		159		967
SAN JUAN 30-5 UNIT #207A	5034	SJ 30-5	30N05W18		1		6		120		20		113		20		13		0		80		69		756
SAN JUAN 30-5 UNIT #208A	5723	SJ 30-5	30N05W19		1		18		1,014		173		950		97		106		0		747		542		968
SAN JUAN 30-5 UNIT #209A	5781	SJ 30-5	30N05W30		1		1		5		1		4		2		0		0		2		2		984
SAN JUAN 30-5 UNIT #210A	5780	SJ 30-5	30N05W30		1		12		233		40		219		37		24		0		157		121		985
SAN JUAN 30-5 UNIT #212A	5782	SJ 30-5	30N05W31		1		10		120		21		113		26		13		0		74		58		987
SAN JUAN 30-5 UNIT #213A	17901	SJ 30-5	30N05W05		1		16		1,081		184		1,013		96		113		0		805		618		643
SAN JUAN 30-5 UNIT #214A	8013	SJ 30-5	30N05W05		1		17		1,026		175		961		96		107		0		758		560		642
SAN JUAN 30-5 UNIT #215A	5702	SJ 30-5	30N05W08		1		16		597		522		2,871		328		319		0		2,224		1,653		993
SAN JUAN 30-5 UNIT #216A	5731	SJ 30-5	30N05W20		1		4		102		17		96		15		11		0		70		64		971
SAN JUAN 30-5 UNIT #217A	5734	SJ 30-5	30N05W21		1		14		556		95		521		62		58		0		402		304		1239
SAN JUAN 30-5 UNIT #218A	5720	SJ 30-5	30N05W17		1		12		349		59		327		44		36		0		247		194		965
SAN JUAN 30-5 UNIT #219A	5108	SJ 30-5	30N05W16		1		12		399		68		374		48		42		0		284		222		730
SAN JUAN 30-5 UNIT #223A	5733	SJ 30-5	30N05W20		1		1		8		1		7		3		1		0		4		4		1238
SAN JUAN 30-5 UNIT #229A	5735	SJ 30-5	30N05W21		1		17		813		139		762		83		85		0		594		433		972
SAN JUAN 30-5 UNIT #230A	5112	SJ 30-5	30N05W32		1		0		0		0		0		0		0		0		0		0		737
SAN JUAN 30-5 UNIT #231A	5139	SJ 30-5	30N05W32		1		3		19		3		17		6		2		0		10		9		736
SAN JUAN 30-5 UNIT #234A	5737	SJ 30-5	30N05W22		1		12		338		58		317		43		35		0		239		188		975
SAN JUAN 30-5 UNIT #237A	5052	SJ 30-5	30N05W16		1		13		619		317		1,740		184		193		0		1,362		1,065		725
SAN JUAN 30-5 UNIT #240A	5738	SJ 30-5	30N05W22		1		14		621		106		582		64		65		0		453		352		974
SAN JUAN 30-5 UNIT #243A	5718	SJ 30-5	30N05W15		1		4		117		20		110		14		12		0		83		76		963
SAN JUAN 30-5 UNIT #260A	9786	SJ 30-5	30N05W09		1		19		2,498		426		2,341		189		260		0		1,892		1,419		646
SAN JUAN 30-5 UNIT #263A	12144	30-5	30N05W13		1		7		476		81		446		42		50		0		354		310		1352
SAN JUAN 30-5 UNIT #264A	5710	SJ 30-5	30N05W09		1		21		1,834		313		1,718		152		191		0		1,375		989		956
SAN JUAN 30-5 UNIT #265A	5711	SJ 30-5	30N05W10		1		19		3,189		544		2,988		231		332		0		2,425		1,839		957
SAN JUAN 30-5 UNIT #266A	8017	SJ 30-5	30N05W10		1		19		2,634		449		2,468		196		274		0		1,998		1,517		645
SAN JUAN 30-6 UNIT #400S	6042	SJ 30-6	30N07W14		1		15		417		21		114		16		13		0		86		63		845
SAN JUAN 30-6 UNIT #401S	6041	SJ 30-6	30N07W13		1		16		513		26		141		18		16		0		107		79		876
SAN JUAN 30-6 UNIT #404S	5516	SJ 30-6	30N07W23		1		12		359		18		99		13		11		0		74		58		778
SAN JUAN 30-6 UNIT #405S	5436	SJ 30-6	30N06W09		1		14		437		22		120		15		13		0		91		69		779
SAN JUAN 30-6 UNIT #408S	19395	SJ 30-6	30N06W16		1		18		802		40		220		25		24		0		171		123		685
SAN JUAN 30-6 UNIT #410S	5539	SJ 30-6	30N06W26		1		16		759		38		208		23		23		0		162		116		864
SAN JUAN 30-6 UNIT #411S	1258	SJ 30-6	30N07W27		1		6		131		7		36		5		4		0		26		23		648
SAN JUAN 30-6 UNIT #412S	996	SJ 30-6	30N07W24		1		13		498		25		137		16		15		0		105		82		781
SAN JUAN 30-6 UNIT #413S	5508	SJ 30-6	30N07W23		1		17		555		28		152		19		17		0		116		84		782
SAN JUAN 30-6 UNIT #414S	1260	SJ 30-6	30N07W35		1		8		75		4		21		6		2		0		12		10		651
SAN JUAN 30-6 UNIT #415S	5077	SJ 30-6	30N07W26		1		16		561		28		154		19		17		0		118		86		761

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 4 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

												REVENUE		OPER.						BFIT NET		10% DISC
						LIFE		GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS		MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 30-6 UNIT #419S	6028	SJ 30-6	30N07W11		1		11		186		9		51		10		6		0		36		27		842
SAN JUAN 30-6 UNIT #420S	6039	SJ 30-6	30N07W12		1		16		733		37		201		22		22		0		157		112		844
SAN JUAN 30-6 UNIT #422S	1261	SJ 30-6	30N07W27		1		16		497		25		136		18		15		0		103		76		690
SAN JUAN 30-6 UNIT #424S	1723	30-6	30N07W33		1		16		665		33		182		21		20		0		141		100		1272
SAN JUAN 30-6 UNIT #425S	1322	SJ 30-6	30N07W33		1		14		731		36		200		21		22		0		157		121		652
SAN JUAN 30-6 UNIT #426S	1271	SJ 30-6	30N07W34		1		9		249		12		68		10		8		0		51		42		650
SAN JUAN 30-6 UNIT #427S	1203	SJ 30-6	30N07W35		1		1		2		0		1		0		0		0		0		0		687
SAN JUAN 30-6 UNIT #430S	5447		30N06W08		1		12		356		18		27		0		0		0		27		20		1260
SAN JUAN 30-6 UNIT #431S	5450	SJ 30-6	30N06W10		1		15		387		19		106		15		12		0		79		59		1221
SAN JUAN 30-6 UNIT #432S	5448	SJ 30-6	30N06W10		1		7		148		7		41		7		5		0		30		25		1220
SAN JUAN 30-6 UNIT #433S	11700	30-6	30N06W11		1		16		733		37		201		22		22		0		157		112		1266
SAN JUAN 30-6 UNIT #434S	5469	SJ 30-6	30N06W12		1		16		966		48		265		26		29		0		209		159		1222
SAN JUAN 30-6 UNIT #435S	5484	SJ 30-6	30N06W13		1		14		321		16		88		13		10		0		65		48		789
SAN JUAN 30-6 UNIT #436S	5525	SJ 30-6	30N06W15		1		16		746		37		205		22		23		0		159		114		848
SAN JUAN 30-6 UNIT #437S	5504	SJ 30-6	30N06W11		1		18		833		42		228		25		25		0		178		129		790
SAN JUAN 30-6 UNIT #438S	5468	SJ 30-6	30N06W12		1		12		389		19		107		14		12		0		81		63		791
SAN JUAN 30-6 UNIT #442S	5485	SJ 30-6	30N06W14		1		12		372		19		102		13		11		0		77		61		1223
SAN JUAN 30-6 UNIT #443S	1206	SJ 30-6	30N06W36		1		15		429		21		118		16		13		0		89		65		649
SAN JUAN 30-6 UNIT #444S	19402	SJ 30-6	30N06W36		1		0		0		0		0		0		0		0		0		0		647
SAN JUAN 30-6 UNIT #445S	5479	SJ 30-6	30N06W13		1		16		493		25		135		18		15		0		103		75		794
SAN JUAN 30-6 UNIT #446S	5502	SJ 30-6	30N06W35		1		14		708		35		194		21		22		0		152		117		795
SAN JUAN 30-6 UNIT #450S	5437	SJ 30-6	30N06W07		1		10		141		7		39		8		4		0		26		20		796
SAN JUAN 30-6 UNIT #451S	5430	SJ 30-6	30N06W07		1		5		141		7		39		5		4		0		29		26		763
SAN JUAN 30-6 UNIT #452S	5438	SJ 30-6	30N06W08		1		16		510		25		140		18		16		0		106		78		797
SAN JUAN 30-6 UNIT #454S	5529	SJ 30-6	30N06W17		1		16		759		38		208		23		23		0		162		116		850
SAN JUAN 30-6 UNIT #455S	5530	SJ 30-6	30N06W18		1		16		759		38		208		23		23		0		162		116		853
SAN JUAN 30-6 UNIT #457S	5257	SJ 30-6	30N06W19		1		21		954		48		262		29		29		0		204		141		764
SAN JUAN 30-6 UNIT #460S	5487	SJ 30-6	30N06W20		1		17		706		35		194		22		22		0		150		109		798
SAN JUAN 30-6 UNIT #461S	5503	SJ 30-6	30N07W11		1		15		482		24		132		17		15		0		100		74		799
SAN JUAN 30-6 UNIT #462S	6040	SJ 30-6	30N07W12		1		16		642		32		176		20		20		0		136		97		843
SAN JUAN 30-6 UNIT #463S	5505	SJ 30-6	30N07W13		1		3		37		2		10		3		1		0		7		6		800
SAN JUAN 30-6 UNIT #468S	5117	SJ 30-6	30N07W36		1		5		67		3		18		4		2		0		12		11		759
SAN JUAN 30-6 UNIT #471S	5488	SJ 30-6	30N06W21		1		9		357		18		98		12		11		0		76		63		803
SAN JUAN 30-6 UNIT #473S	5535	SJ 30-6	30N06W22		1		16		746		37		205		22		23		0		159		114		858
SAN JUAN 30-6 UNIT #475S	5493	SJ 30-6	30N06W27		1		18		647		32		177		22		20		0		136		96		804
SAN JUAN 30-6 UNIT #476S	5541	SJ 30-6	30N06W28		1		18		808		40		222		24		25		0		173		125		863
SAN JUAN 30-6 UNIT #477S	5130	SJ 30-6	30N06W28		1		17		1,508		75		414		36		46		0		332		253		760
SAN JUAN 30-6 UNIT #478S	5137	SJ 30-6	30N06W29		1		7		221		11		61		8		7		0		46		40		746
SAN JUAN 30-6 UNIT #479S	5542	SJ 30-6	30N06W29		1		16		759		38		208		23		23		0		162		116		869
SAN JUAN 30-6 UNIT #481S	5431	SJ 30-6	30N06W30		1		14		603		30		165		19		18		0		128		99		765
SAN JUAN 30-6 UNIT #483S	5500	SJ 30-6	30N06W34		1		18		1,000		50		274		28		30		0		216		157		806
SAN JUAN 30-6 UNIT #484S	5499	SJ 30-6	30N06W34		1		19		1,040		52		285		29		32		0		224		162		807
SAN JUAN 30-6 UNIT #485S	5116	SJ 30-6	30N07W36		1		10		197		10		54		9		6		0		39		31		996

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 5 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

												REVENUE		OPER.						BFIT NET		10% DISC
						LIFE		GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS		MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 30-6 UNIT #486S	5143	SJ 30-6	30N06W23		1		8		152		8		42		7		5		0		30		25		766
SAN JUAN 30-6 UNIT #488S	5490	SJ 30-6	30N06W24		1		11		177		9		49		9		5		0		34		26		808
SAN JUAN 30-6 UNIT #489S	5489	SJ 30-6	30N06W24		1		14		343		17		94		14		10		0		70		52		809
SAN JUAN 30-6 UNIT #490S	5492	SJ 30-6	30N06W25		1		13		305		15		84		13		9		0		61		46		810
SAN JUAN 30-6 UNIT #491S	5491	SJ 30-6	30N06W25		1		14		318		16		87		13		10		0		64		48		811
SAN JUAN 30-6 UNIT #493S	5131	SJ 30-6	30N06W32		1		1		14		1		4		1		0		0		2		2		744
SAN JUAN 30-6 UNIT #495S	5497	SJ 30-6	30N06W33		1		17		800		40		220		24		24		0		172		122		813
SAN JUAN 30-6 UNIT #496S	5501	SJ 30-6	30N06W35		1		10		401		20		110		13		12		0		85		69		814
SAN JUAN 30-6 UNIT #497S	1778	30-6	30N07W29		1		16		665		33		182		21		20		0		141		100		1277
SAN JUAN 30-6 UNIT COM #467S	6049	NEBU	30N07W22		1		16		759		22		119		13		13		0		93		66		822
SAN JUAN 31-6 UNIT #201A	1813	SJ 31-6	30N06W01		1		21		1,064		114		626		67		70		0		490		343		706
SAN JUAN 31-6 UNIT #202A	1812	SJ 31-6	30N06W01		1		3		84		9		50		8		6		0		37		34		1211
SAN JUAN 31-6 UNIT #203A	1819	SJ 31-6	30N06W03		1		18		687		74		404		49		45		0		310		220		718
SAN JUAN 31-6 UNIT #204A	1817	SJ 31-6	30N06W03		1		13		516		55		303		36		34		0		233		181		707
SAN JUAN 31-6 UNIT #205A	1821	SJ 31-6	30N06W04		1		1		3		0		2		1		0		0		1		1		712
SAN JUAN 31-6 UNIT #206A	1820	SJ 31-6	30N06W04		1		9		139		15		82		16		9		0		57		46		708
SAN JUAN 31-6 UNIT #210A	1816	SJ 31-6	30N06W02		1		16		673		72		396		45		44		0		307		230		719
SAN JUAN 31-6 UNIT #211A	1815	SJ 31-6	30N06W02		1		16		1,133		121		667		64		74		0		528		400		710
SAN JUAN 31-6 UNIT #212A	5613	SJ 31-6	30N06W05		1		15		424		45		249		35		28		0		187		138		935
SAN JUAN 31-6 UNIT #213A	5612	SJ 31-6	30N06W05		1		15		459		49		270		37		30		0		203		150		936
SAN JUAN 31-6 UNIT #214A	1360	SJ 31-6	31N06W36		1		16		742		79		437		49		49		0		339		253		702
SAN JUAN 31-6 UNIT #215A	1361	SJ 31-6	31N06W36		1		11		653		70		384		39		43		0		302		246		653
SAN JUAN 31-6 UNIT #217A	1363	SJ 31-6	31N06W35		1		13		404		43		238		32		26		0		180		138		703
SAN JUAN 31-6 UNIT #223A	1377	SJ 31-6	31N06W32		1		7		119		13		70		14		8		0		49		41		654
SAN JUAN 31-6 UNIT #229A	1386	SJ 31-6	31N06W28		1		20		1,212		130		713		71		79		0		563		404		715
SAN JUAN 31-6 UNIT #230A	1383	SJ 31-6	31N06W27		1		20		1,353		145		796		77		88		0		630		453		705
SAN JUAN 31-6 UNIT #231A	1384	SJ31-6	31N06W27		1		5		100		11		59		10		7		0		42		38		704
SAN JUAN 31-6 UNIT #234A	1385	SJ 31-6	31N06W29		1		13		462		50		272		34		30		0		208		160		688
SAN JUAN 32-7 UNIT #203A	5109	SJ 32-7	32N07W22		1		16		1,182		197		1,083		102		120		0		860		659		664
SAN JUAN 32-7 UNIT #204A	4126	SJ 32-7	32N07W36		1		10		128		21		117		27		13		0		78		61		1176
SAN JUAN 32-7 UNIT #206A	719	SJ 32-7	32N07W27		1		20		1,615		269		1,479		136		164		0		1,179		855		722
SAN JUAN 32-7 UNIT #207A	5812	SJ 32-7	32N07W27		1		13		827		138		758		75		84		0		598		475		1174
SAN JUAN 32-7 UNIT #208A	970	SJ 32-7	32N07W34		1		15		826		317		1,741		181		193		0		1,366		1,052		670
SAN JUAN 32-7 UNIT #209A	1207	SJ 32-7	32N07W35		1		18		1,422		237		1,302		120		145		0		1,037		773		672
SAN JUAN 32-7 UNIT #210A	4125	SJ 32-7	32N07W36		1		20		1,112		185		1,018		105		113		0		800		571		1177
SAN JUAN 32-7 UNIT #211A	648	SJ 32-7	32N07W35		1		20		1,391		232		1,274		123		142		0		1,010		725		721
SAN JUAN 32-7 UNIT #213A	12143	32-7	31N07W18		1		19		1,609		169		931		84		103		0		743		528		1351
SAN JUAN 32-7 UNIT #214A	5804	SJ 32-7	32N07W34		1		5		194		74		409		51		45		0		312		280		1178
SAN JUAN 32-7 UNIT #215A	1210	SJ 32-7	32N07W32		1		16		1,395		232		1,278		116		142		0		1,020		779		671
SAN JUAN 32-7 UNIT #216A	6120	SJ 32-7	31N07W04		1		11		414		69		379		46		42		0		291		236		1242
SAN JUAN 32-7 UNIT #217A	655	SJ 32-7	31N07W04		1		6		307		51		281		30		31		0		219		195		716
SAN JUAN 32-7 UNIT #218A	1208	SJ 32-7	31N07W07		1		17		1,565		261		1,434		127		159		0		1,148		878		662
SAN JUAN 32-7 UNIT #219A	6122	SJ 32-7	31N07W05		1		16		1,657		276		1,518		130		169		0		1,219		953		1243

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 6 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

												REVENUE		OPER.						BFIT NET		10% DISC
						LIFE		GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS		MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 32-7 UNIT #221A	694	SJ 32-7	31N07W08		1		11		283		47		259		38		29		0		192		152		711
SAN JUAN 32-7 UNIT #222A	6008	SJ 32-7	32N07W20		1		17		1,158		175		960		92		107		0		761		552		1180
SAN JUAN 32-7 UNIT #224A	4795	SJ 32-7	32N07W21		1		11		885		116		636		56		71		0		509		422		659
SAN JUAN 32-7 UNIT #228A	12142	32-7	31N07W07		1		19		1,609		137		753		68		84		0		601		427		1350
SAN JUAN 32-7 UNIT #229A	4893	SJ 32-7	31N07W09		1		7		212		35		194		26		22		0		147		127		714
SAN JUAN 32-7 UNIT #230A	5798	SJ 32-7	31N07W17		1		0		0		0		0		0		0		0		0		0		1171
SAN JUAN 32-7 UNIT #231A	1323	SJ 32-7	31N07W17		1		8		187		31		171		27		19		0		125		105		663
SAN JUAN 32-7 UNIT #232A	4127	SJ 32-7	31N07W08		1		15		1,016		169		930		90		103		0		737		570		709
SAN JUAN 32-7 UNIT #234A	1229	SJ 32-7	32N07W32		1		8		185		31		169		26		19		0		124		104		661
SAN JUAN 32-7 UNIT #235A	5811	SJ 32-7	32N07W29		1		19		1,552		259		1,421		130		158		0		1,133		806		1175
SAN JUAN 32-7 UNIT #238A	1211	SJ 32-7	32N07W29		1		19		3,143		524		2,878		227		320		0		2,332		1,768		674
SAN JUAN 32-7 UNIT #242A	1212	SJ 32-7	32N07W33		1		13		853		142		781		77		87		0		617		491		669
SAN JUAN 32-7 UNIT #246	740	SJ 32-7	32N07W18		1		19		1,700		283		1,557		139		173		0		1,244		883		1172
SAN JUAN 32-8 UNIT #202A	1495	SJ 32-8	32N08W27		1		18		1,930		220		1,211		103		135		0		973		741		698
SAN JUAN 32-8 UNIT #203A	1213	SJ 32-8	32N08W33		1		7		332		38		208		24		23		0		162		140		686
SAN JUAN 32-8 UNIT #204A	5142	SJ 32-8	32N08W34		1		23		3,103		354		1,946		158		216		0		1,572		1,135		732
SAN JUAN 32-8 UNIT #205A	1504	SJ 32-8	32N08W34		1		16		1,868		213		1,172		98		130		0		943		737		680
SAN JUAN 32-8 UNIT #208A	4275	SJ 32-8	32N08W29		1		19		3,313		378		2,078		162		231		0		1,685		1,277		726
SAN JUAN 32-8 UNIT #213A	6003	SJ 32-8	32N08W22		1		20		1,830		209		1,148		102		128		0		919		647		1154
SAN JUAN 32-8 UNIT #218A	1514	SJ 32-8	32N08W35		1		21		2,457		280		1,541		129		171		0		1,241		910		691
SAN JUAN 32-8 UNIT #219A	1529	SJ 32-8	32N08W35		1		19		1,573		180		987		90		110		0		787		579		678
SAN JUAN 32-8 UNIT #220A	5602	SJ 32-8	31N08W24		1		15		874		100		549		56		61		0		432		332		1232
SAN JUAN 32-8 UNIT #221A	5583	SJ 32-8	31N08W09		1		6		283		32		178		20		20		0		138		122		1140
SAN JUAN 32-8 UNIT #222A	5584	SJ 32-8	31N08W09		1		22		2,024		231		1,270		112		141		0		1,016		725		1139
SAN JUAN 32-8 UNIT #223A	5588	SJ 32-8	31N08W10		1		16		2,048		234		1,285		105		143		0		1,036		815		1142
SAN JUAN 32-8 UNIT #224A	5589	SJ 32-8	31N08W10		1		14		1,354		155		849		74		94		0		681		542		1141
SAN JUAN 32-8 UNIT #225A	5592	SJ 32-8	31N08W15		1		15		922		105		578		58		64		0		456		351		1227
SAN JUAN 32-8 UNIT #226A	5593	SJ 32-8	31N08W15		1		15		882		101		554		56		62		0		436		335		1228
SAN JUAN 32-8 UNIT #227A	5594	SJ 32-8	31N08W16		1		14		663		76		416		46		46		0		324		250		1148
SAN JUAN 32-8 UNIT #228A	5595	SJ 32-8	31N08W16		1		12		727		83		456		46		51		0		359		288		1147
SAN JUAN 32-8 UNIT #229A	1204	SJ 32-8	32N08W20		1		20		2,178		249		1,367		116		152		0		1,099		815		660
SAN JUAN 32-8 UNIT #230A	1544	SJ 32-8	32N08W28		1		23		2,387		272		1,497		128		166		0		1,203		856		697
SAN JUAN 32-8 UNIT #231A	1541	SJ 32-8	32N08W28		1		22		3,382		386		2,122		169		236		0		1,717		1,255		677
SAN JUAN 32-8 UNIT #232A	972	SJ 32-8	32N08W29		1		17		1,670		191		1,047		92		116		0		839		640		665
SAN JUAN 32-8 UNIT #233A	5675	SJ 32-8	32N08W30		1		19		1,645		188		1,032		92		115		0		825		613		1237
SAN JUAN 32-8 UNIT #234A	4904	SJ 32-8	31N08W21		1		12		555		63		348		38		39		0		271		218		1150
SAN JUAN 32-8 UNIT #235A	5597	SJ 32-8	31N08W21		1		9		360		41		226		27		25		0		174		146		1149
SAN JUAN 32-8 UNIT #236A	5599	SJ 32-8	31N08W22		1		17		736		84		462		53		51		0		357		260		1229
SAN JUAN 32-8 UNIT #237A	5601	SJ 32-8	31N08W23		1		16		648		74		406		47		45		0		314		235		1231
SAN JUAN 32-8 UNIT #238A	5600	SJ 32-8	31N08W23		1		13		729		83		457		47		51		0		359		285		1230
SAN JUAN 32-8 UNIT #239A	5670	SJ 32-8	32N08W30		1		9		214		24		134		20		15		0		99		82		1161
SAN JUAN 32-8 UNIT #240A	5047	SJ 32-8	31N08W03		1		15		1,352		154		848		76		94		0		678		531		997
SAN JUAN 32-8 UNIT #241A	5558	SJ 32-8	31N08W04		1		14		1,707		195		1,071		89		119		0		863		693		1224

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 7 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

												REVENUE		OPER.						BFIT NET		10% DISC
						LIFE		GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS		MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 32-8 UNIT #242A	5557	SJ 32-8	31N08W04		1		11		338		39		212		29		24		0		160		126		1138
SAN JUAN 32-8 UNIT #243A	1884	SJ 32-8	31N08W11		1		16		1,137		130		713		68		79		0		566		434		679
SAN JUAN 32-8 UNIT #244A	5591	SJ 32-8	31N08W14		1		15		923		105		579		58		64		0		457		351		1226
SAN JUAN 32-8 UNIT #245A	5590	SJ 32-8	31N08W14		1		13		978		112		613		57		68		0		488		391		1225
SAN JUAN 32-8 UNIT #247A	5999	SJ 32-8	32N08W19		1		15		1,077		123		676		65		75		0		536		413		1199
SAN JUAN 32-8 UNIT #248A	1885	SJ 32-8	31N08W11		1		12		498		57		312		36		35		0		241		191		676
SAN JUAN 32-8 UNIT #249R	11696	32-8	31N08W03		1		20		1,830		209		1,148		102		128		0		919		647		1265
SAN JUAN 32-8 UNIT #250A	5048	SJ 32-8	32N08W33		1		15		2,256		258		1,415		114		157		0		1,144		908		723
SAN JUAN 32-8 UNIT #253A	1887	SJ 32-8	32N08W27		1		20		1,850		211		1,161		102		129		0		929		683		699
SAN JUAN 32-8 UNIT #254A	12149	32-8	32N08W23		1		20		1,965		224		1,233		108		137		0		988		695		1355
SAN JUAN 32-8 UNIT #255A	1867	SJ 32-8	32N08W24		1		17		1,560		178		979		87		109		0		783		598		701
SAN JUAN 32-8 UNIT #256A	1888	SJ 32-8	32N08W25		1		17		1,659		189		1,040		91		116		0		834		634		700
SAN JUAN 32-8 UNIT #257A	6000	SJ 32-8	32N08W19		1		4		160		18		101		12		11		0		78		71		1200
SAN JUAN 32-9 UNIT #201S	5935	SJ 32-9	31N09W02		1		12		224		5		27		5		3		0		19		15		1076
SAN JUAN 32-9 UNIT #202S	5939	SJ 32-9	31N09W02		1		19		1,061		23		129		13		14		0		101		73		1075
SAN JUAN 32-9 UNIT #217S	5994	32-9	32N09W16		1		7		476		9		50		5		6		0		40		35		1322
SAN JUAN 32-9 UNIT #226S	5970	SJ 32-9	32N09W32		1		7		500		11		61		6		7		0		48		42		1119
SAN JUAN 32-9 UNIT #228S	5978	SJ 32-9	32N09W36		1		15		440		10		53		7		6		0		40		30		1127
SAN JUAN 32-9 UNIT #235S	5979	SJ 32-9	32N09W36		1		15		466		10		57		7		6		0		43		32		1126
SAN JUAN 32-9 UNIT #250S	5945	SJ 32-9	31N09W04		1		14		1,396		31		169		14		19		0		136		109		1240
SAN JUAN 32-9 UNIT #253S	5952	SJ 32-9	31N09W05		1		7		476		11		58		5		6		0		46		40		1079
SAN JUAN 32-9 UNIT #254S	5953	SJ 32-9	31N09W06		1		10		395		9		48		6		5		0		37		30		1082
SAN JUAN 32-9 UNIT #257S	5957	SJ 32-9	31N09W08		1		10		128		3		16		3		2		0		10		8		1083
SAN JUAN 32-9 UNIT #261S	5961	SJ 32-9	31N09W10		1		16		1,209		27		147		14		16		0		117		89		1087
SAN JUAN 32-9 UNIT #270S	5991	SJ 32-9	32N09W18		1		6		409		9		50		5		6		0		39		34		1103
SAN JUAN 32-9 UNIT #271S	1351	SJ 32-9	32N09W18		1		13		1,051		23		128		12		14		0		102		82		733
SAN JUAN 32-9 UNIT #273S	5980	SJ 32-9	32N09W19		1		6		430		9		52		5		6		0		41		36		1104
SAN JUAN 32-9 UNIT #274S	5962	SJ 32-9	32N09W28		1		13		1,040		23		126		12		14		0		101		80		1113
SAN JUAN 32-9 UNIT #275S	5965	SJ 32-9	32N09W29		1		13		824		18		100		10		11		0		79		63		1114
SAN JUAN 32-9 UNIT #276S	5964	SJ 32-9	32N09W27		1		13		363		8		44		6		5		0		33		25		1112
SAN JUAN 32-9 UNIT #277S	5966	SJ 32-9	32N09W30		1		22		2,252		50		273		23		30		0		220		157		1115
SAN JUAN 32-9 UNIT #279S	5968	SJ 32-9	32N09W31		1		7		476		11		58		5		6		0		46		40		1116
SAN JUAN 32-9 UNIT #281S	5974	SJ 32-9	32N09W32		1		7		452		10		55		5		6		0		44		38		1118
SAN JUAN 32-9 UNIT #282S	5975	SJ 32-9	32N09W33		1		18		1,374		30		167		15		19		0		133		98		1121
SAN JUAN 32-9 UNIT #283S	5976	SJ 32-9	32N09W33		1		12		221		5		27		5		3		0		19		15		1120
SAN JUAN 32-9 UNIT #284S	1357	SJ 32-9	32N10W13		1		9		800		18		97		9		11		0		78		66		998
SAN JUAN 32-9 UNIT #286S	5914	SJ 32-9	32N10W14		1		6		430		9		52		5		6		0		41		36		1098
SAN JUAN 32-9 UNIT #287S	5915	SJ 32-9	32N10W14		1		7		452		10		55		5		6		0		44		38		1097
SAN JUAN 32-9 UNIT #289S	5918	SJ 32-9	32N10W23		1		6		430		9		52		5		6		0		41		36		1105
SAN JUAN 32-9 UNIT #291S	5402	SJ 32-9	32N10W24		1		8		494		11		60		6		7		0		47		41		728
SAN JUAN 32-9 UNIT #293S	5927	SJ 32-9	32N10W25		1		15		959		21		116		11		13		0		92		71		1108
SAN JUAN 32-9 UNIT #294S	5930	SJ 32-9	32N10W26		1		1		5		0		1		0		0		0		0		0		1111
SAN JUAN 32-9 UNIT #295S	5931	SJ 32-9	32N10W26		1		17		1,612		36		196		17		22		0		157		120		1110

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 8 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.		ADV&SEV				BFIT NET		10% DISC
					LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		TAXES		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS	YEARS	MMCF		MMCF		M$		M$		M$		M$		M$		M$		NUM
SAN JUAN 32-9 UNIT #300S	5856	SJ 32-9	32N10W11	1	3		84		2		10		2		1		0		8		7		1092
SAN JUAN 32-9 UNIT #301S	5857	SJ 32-9	32N10W12	1	7		406		9		49		5		5		0		39		34		1095
SAN JUAN 32-9 UNIT #302S	747	32-9	32N09W09	1	7		476		11		58		5		6		0		46		40		1263
STATE COM FC #20A	6006	NON-UNIT	30N08W02	1	9		141		3		14		3		2		0		10		8		1069
NE BLANCO UNIT #306 POW	4897	NEBU	31N07W26	1	10		500		4		21		2		2		0		17		11		727
SAN JUAN 29-6 UNIT #44A	5623	SJ 29-6	29N06W26	1	21		900		102		562		59		62		0		440		233		1234
SAN JUAN 29-6 UNIT #45A	5637	SJ 29-6	29N06W27	1	21		900		109		598		63		67		0		469		244		1235
SAN JUAN 29-6 UNIT #63A	5638	SJ 29-6	29N06W30	1	21		900		109		598		63		67		0		469		244		1236
TOTAL PROVED DEVELOPED: 160- Acre New Mexico				316			254,554		23,810		130,790		12,970		14,536		0		103,284		77,517
BARNES GAS COM F #1	14369	NON-UNIT	32N11W26	1	9		53		3		16		7		2		0		7		5		474
BLANCO #201	13592	NON-UNIT	31N08W35	1	22		1,044		154		847		94		94		0		659		452		413
BLANCO #202	13651	NON-UNIT	31N08W26	1	30		2,631		388		2,134		194		237		0		1,703		1,091		509
BLANCO #203	13649	NON-UNIT	31N08W35	1	15		647		96		525		61		58		0		406		306		498
BLANCO #204R	14451	NON-UNIT	31N08W26	1	20		841		124		682		79		76		0		527		369		591
BLANCO #330	14219	NON-UNIT	31N08W05	1	27		3,038		222		1,219		105		136		0		979		662		547
BONDS COM #100 (APO)	14220	NON-UNIT	32N10W15	1	31		5,110		254		1,397		107		155		0		1,135		754		455
DECKER GAS COM A #1	14370	NON-UNIT	32N10W17	1	19		1,688		123		678		61		75		0		542		401		477
EAGLE #750 (BPO)	14375	NON-UNIT	32N09W16	1	24		1,419		28		154		15		17		0		122		82		495
FC BARNES #1	14371	NON-UNIT	32N11W15	1	34		616		11		59		15		7		0		38		20		418
FC FEE COM #2	14277	NON-UNIT	32N11W30	1	8		48		1		5		3		1		0		1		1		497
FC STATE COM #19	14276	NON-UNIT	30N09W36	1	22		207		4		22		6		2		0		14		8		541
FC STATE COM #20	12651	NON-UNIT	30N08W02	1	19		1,635		29		161		15		18		0		128		94		466
FEDERAL G #4 COM.PI	4755	NON-UNIT	31N07W10	1	21		977		41		224		25		25		0		174		120		467
GRASSY CANYON UNIT #3	4762	SJ 32-7	32N07W31	1	25		2,195		142		779		70		87		0		622		423		580
HEIZER #100	14203	NON-UNIT	32N10W15	1	18		2,376		1		6		1		1		0		5		4		378
HUBBARD GAS COM A #1	14250	NON-UNIT	32N11W30	1	16		124		4		24		11		3		0		10		7		496
HUERFANO UNIT #12	14215	HUERFANO	26N10W04	1	0		0		0		0		0		0		0		0		0		352
HUERFANO UNIT #138	17003	HUERFANO	26N09W22	1	6		43		6		33		12		4		0		17		14		350
HUERFANO UNIT #14R	14218	HUERFANO	26N10W05	1	22		296		42		230		49		26		0		155		95		362
HUERFANO UNIT #18 COM	16974	HUERFANO	27N10W32	1	0		0		0		0		0		0		0		0		0		355
HUERFANO UNIT #182	17019	HUERFANO	26N09W28	1	0		0		0		0		0		0		0		0		0		360
HUERFANO UNIT #19	14221	HUERFANO	26N10W05	1	2		9		1		7		3		1		0		3		3		354
HUERFANO UNIT #22	14216	HUERFANO	27N10W33	1	29		439		62		341		67		38		0		236		129		356
HUERFANO UNIT #223	14004	HUERFANO	26N10W04	1	19		271		38		211		43		23		0		144		94		363
HUERFANO UNIT #231	17004	HUERFANO	26N09W06	1	23		440		62		342		58		38		0		246		153		364
HUERFANO UNIT #237	17005	HUERFANO	26N09W17	1	23		341		48		265		54		29		0		182		108		365
HUERFANO UNIT #24	14222	HUERFANO	27N10W29	1	10		120		17		93		22		10		0		61		47		357
HUERFANO UNIT #255	17006	HUERFANO	27N09W31	1	40		1,190		168		924		122		103		0		699		352		369
HUERFANO UNIT #257	17007	HUERFANO	27N10W36	1	39		939		133		729		108		81		0		541		271		367
HUERFANO UNIT #259	13989	HUERFANO	26N10W06	1	5		25		4		19		9		2		0		9		7		368
HUERFANO UNIT #282	14512	HUERFANO	27N10W31	1	18		341		48		265		45		29		0		191		130		372
HUERFANO UNIT #286	14202	HUERFANO	27N10W35	1	40		918		130		713		109		79		0		525		251		374
HUERFANO UNIT #46	13951	HUERFANO	26N09W23	1	23		475		67		369		60		41		0		268		168		349

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 9 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.		ADV&SEV				BFIT NET		10% DISC
					LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		TAXES		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS	YEARS	MMCF		MMCF		M$		M$		M$		M$		M$		M$		NUM
HUERFANO UNIT #501	17009	HUERFANO	26N09W20	1	28		674		95		524		77		58		0		389		228		599
HUERFANO UNIT #502	17010	HUERFANO	26N09W21	1	0		0		0		0		0		0		0		0		0		602
HUERFANO UNIT #503	13987	HUERFANO	26N09W21	1	5		40		6		31		10		3		0		18		16		601
HUERFANO UNIT #504	17011	HUERFANO	26N09W22	1	3		19		3		15		5		2		0		8		7		608
HUERFANO UNIT #505	17012	HUERFANO	26N09W30	1	40		924		131		718		109		80		0		529		259		600
HUERFANO UNIT #507	17013	HUERFANO	26N09W27	1	22		393		56		305		55		34		0		217		134		604
HUERFANO UNIT #508	13985	HUERFANO	26N09W26	1	40		974		138		756		111		84		0		561		274		605
HUERFANO UNIT #509	13999	HUERFANO	27N10W30	1	18		252		36		196		41		22		0		133		86		607
HUERFANO UNIT #518	17014	HUERFANO	26N09W16	1	30		473		67		367		70		41		0		256		138		609
HUERFANO UNIT #520	17015	HUERFANO	26N09W17	1	24		368		52		286		56		32		0		198		118		610
HUERFANO UNIT #521	17016	HUERFANO	27N10W35	1	40		1,265		179		983		126		109		0		748		361		612
HUERFANO UNIT #522	17017	HUERFANO	27N09W31	1	36		1,131		160		879		113		98		0		668		359		611
HUERFANO UNIT #523	14008	HUERFANO	26N09W23	1	23		435		61		338		57		38		0		243		151		613
HUERFANO UNIT #528	12464	HUERFANO	26N10W06	1	26		363		51		282		58		31		0		192		110		620
HUERFANO UNIT #549	13950	HUERFANO	27N10W33	1	15		205		29		159		34		18		0		108		75		598
HUERFANO UNIT #55	14223	HUERFANO	26N09W27	1	19		275		39		214		44		24		0		146		93		347
HUERFANO UNIT #550	17018	HUERFANO	27N10W29	1	23		257		36		199		49		22		0		128		75		606
HUERFANO UNIT #59	13952	HUERFANO	26N09W26	1	10		69		10		53		18		6		0		29		22		348
HUERFANO UNIT #6	14377	HUERFANO	27N10W31	1	15		129		18		101		29		11		0		60		40		359
HUERFANO UNIT #600	706	HUERFANO	27N10W32	1	6		66		9		52		13		6		0		32		27		673
HUERFANO UNIT #70	14224	HUERFANO	26N10W08	1	8		78		11		61		17		7		0		37		29		351
HUERFANO UNIT #74	13988	HUERFANO	27N10W19	1	2		11		2		9		4		1		0		3		3		358
HUERFANO UNIT COM #118	4765	HUERFANO	27N10W30	1	9		106		8		41		10		5		0		27		21		366
HUERFANO UNIT COM #551	4766	HUERFANO	26N09W16	1	10		124		7		36		8		4		0		24		18		626
JACQUEZ #331	14343	NON-UNIT	31N08W06	1	31		3,288		251		1,379		111		153		0		1,115		715		530
KEYS GAS COM G #1R	14212	NON-UNIT	32N10W27	1	19		915		1		7		1		1		0		6		4		375
MOORE, WAYNE COM #2	14442	NON-UNIT	31N09W16	1	25		1,099		41		224		26		25		0		174		113		578
NE BLANCO UNIT #400R	14350	NEBU	31N06W07	1	24		2,646		21		113		9		13		0		92		64		550
NE BLANCO UNIT #401	14278	NEBU	30N07W09	1	15		675		5		29		3		3		0		23		17		34
NE BLANCO UNIT #402	13561	NEBU	30N07W05	1	25		2,142		17		92		7		10		0		74		51		376
NE BLANCO UNIT #403R	14279	NEBU	30N07W09	1	28		2,185		17		93		8		10		0		75		49		189
NE BLANCO UNIT #404R	14280	NEBU	31N07W34	1	16		1,534		12		66		5		7		0		53		41		561
NE BLANCO UNIT #406	13560	NEBU	31N07W22	1	24		1,864		14		80		7		9		0		64		44		377
NE BLANCO UNIT #407	14281	NEBU	30N07W21	1	28		1,562		12		67		6		7		0		53		34		36
NE BLANCO UNIT #408	13562	NEBU	31N07W20	1	18		905		7		39		4		4		0		31		22		406
NE BLANCO UNIT #409	14282	NEBU	30N07W10	1	16		933		7		40		4		4		0		32		24		35
NE BLANCO UNIT #410	14283	NEBU	31N07W09	1	18		1,679		13		72		6		8		0		58		43		421
NE BLANCO UNIT #411	14284	NEBU	30N07W10	1	26		1,566		12		67		6		7		0		54		35		78
NE BLANCO UNIT #412	14285	NEBU	31N07W29	1	15		1,052		8		45		4		5		0		36		28		408
NE BLANCO UNIT #413R	14286	NEBU	30N07W20	1	19		996		8		43		4		5		0		34		24		257
NE BLANCO UNIT #414	13569	NEBU	31N07W30	1	15		857		7		37		3		4		0		29		23		403
NE BLANCO UNIT #415	14287	NEBU	30N07W02	1	24		1,332		10		57		5		6		0		45		30		71
NE BLANCO UNIT #416	13563	NEBU	31N07W21	1	22		817		6		35		4		4		0		27		18		395

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 10 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.		ADV&SEV				BFIT NET		10% DISC
					LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		TAXES		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS	YEARS	MMCF		MMCF		M$		M$		M$		M$		M$		M$		NUM
NE BLANCO UNIT #417	14288	NEBU	30N07W02	1	31		2,852		22		122		10		14		0		99		63		72
NE BLANCO UNIT #418	14289	NEBU	31N07W28	1	13		872		7		37		3		4		0		30		24		410
NE BLANCO UNIT #419	14290	NEBU	30N07W03	1	22		1,764		14		75		6		8		0		61		43		77
NE BLANCO UNIT #420	13564	NEBU	31N07W28	1	2		8		0		0		0		0		0		0		0		394
NE BLANCO UNIT #421R	14291	NEBU	30N07W04	1	20		1,842		14		79		6		9		0		64		46		151
NE BLANCO UNIT #422	13570	NEBU	31N07W20	1	15		335		3		14		2		2		0		11		8		397
NE BLANCO UNIT #423R	14292	NEBU	30N07W08	1	19		1,717		13		73		6		8		0		59		44		286
NE BLANCO UNIT #424	14293	NEBU	30N07W04	1	24		2,385		19		102		8		11		0		83		58		385
NE BLANCO UNIT #425R	14294	NEBU	30N07W08	1	27		2,653		21		113		9		13		0		92		61		169
NE BLANCO UNIT #426	14262	NEBU	31N06W06	1	25		2,115		16		90		7		10		0		73		49		440
NE BLANCO UNIT #427R	14295	NEBU	30N07W16	1	17		884		7		38		4		4		0		30		22		194
NE BLANCO UNIT #428	13571	NEBU	31N07W24	1	19		1,472		11		63		5		7		0		51		37		420
NE BLANCO UNIT #429R	14296	NEBU	30N07W17	1	5		86		1		4		1		0		0		3		2		226
NE BLANCO UNIT #430	13565	NEBU	30N07W05	1	16		678		5		29		3		3		0		23		17		398
NE BLANCO UNIT #431	14297	NEBU	30N07W17	1	32		2,459		19		105		9		12		0		85		52		74
NE BLANCO UNIT #432	13566	NEBU	30N07W07	1	22		1,839		14		79		6		9		0		64		45		399
NE BLANCO UNIT #433	14298	NEBU	30N07W19	1	13		234		2		10		2		1		0		7		5		76
NE BLANCO UNIT #434	14299	NEBU	31N07W23	1	21		2,323		18		99		7		11		0		81		59		423
NE BLANCO UNIT #435	14300	NEBU	30N08W01	1	23		1,064		8		46		4		5		0		36		24		383
NE BLANCO UNIT #436	13572	NEBU	31N06W19	1	21		1,179		9		50		5		6		0		40		28		425
NE BLANCO UNIT #437	14301	NEBU	30N08W12	1	26		1,119		9		48		5		5		0		38		24		382
NE BLANCO UNIT #438	14361	NEBU	31N06W18	1	25		1,078		8		46		5		5		0		36		24		452
NE BLANCO UNIT #439	14302	NEBU	30N08W13	1	26		2,383		19		102		8		11		0		83		56		380
NE BLANCO UNIT #440	13573	NEBU	31N07W11	1	22		1,490		12		64		5		7		0		51		36		431
NE BLANCO UNIT #441R	14303	NEBU	30N08W24	1	32		1,681		13		72		7		8		0		57		34		475
NE BLANCO UNIT #442	14304	NEBU	31N07W11	1	23		1,628		13		70		6		8		0		56		39		436
NE BLANCO UNIT #443	14305	NEBU	30N08W24	1	30		1,420		11		61		6		7		0		48		29		381
NE BLANCO UNIT #444	14362	NEBU	31N07W23	1	16		1,433		11		61		5		7		0		50		38		461
NE BLANCO UNIT #445	14306	NEBU	31N08W25	1	30		2,036		16		87		7		10		0		70		44		388
NE BLANCO UNIT #446	14307	NEBU	31N07W33	1	20		637		5		27		3		3		0		21		14		400
NE BLANCO UNIT #447	14308	NEBU	31N08W36	1	19		1,186		9		51		5		6		0		41		29		379
NE BLANCO UNIT #448	13567	NEBU	31N07W32	1	17		827		6		35		3		4		0		28		21		384
NE BLANCO UNIT #449	14309	NEBU	31N07W19	1	23		1,039		8		44		4		5		0		35		24		391
NE BLANCO UNIT #450	14310	NEBU	31N07W32	1	15		588		5		25		3		3		0		20		15		389
NE BLANCO UNIT #451	14311	NEBU	30N07W06	1	25		1,521		12		65		6		7		0		52		35		405
NE BLANCO UNIT #452	13574	NEBU	31N07W15	1	18		790		6		34		3		4		0		27		19		422
NE BLANCO UNIT #453	14312	NEBU	30N07W06	1	27		1,750		14		75		7		8		0		60		39		390
NE BLANCO UNIT #454	14313	NEBU	31N07W33	1	20		984		8		42		4		5		0		33		23		409
NE BLANCO UNIT #455	14314	NEBU	31N07W31	1	30		3,675		29		157		12		17		0		128		84		387
NE BLANCO UNIT #456	13575	NEBU	31N07W26	1	8		229		2		10		1		1		0		8		6		417
NE BLANCO UNIT #457	14315	NEBU	31N07W31	1	20		1,217		9		52		5		6		0		42		29		392
NE BLANCO UNIT #458	13576	NEBU	31N07W13	1	16		751		6		32		3		4		0		25		19		416
NE BLANCO UNIT #459	14316	NEBU	31N07W19	1	30		3,449		27		147		11		16		0		120		78		415

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 11 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.		ADV&SEV				BFIT NET		10% DISC
					LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		TAXES		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS	YEARS	MMCF		MMCF		M$		M$		M$		M$		M$		M$		NUM
NE BLANCO UNIT #460	14351	NEBU	31N06W07	1	24		2,377		18		102		8		11		0		82		57		424
NE BLANCO UNIT #461	14317	NEBU	30N07W07	1	22		1,069		8		46		4		5		0		36		24		543
NE BLANCO UNIT #462	14318	NEBU	31N07W01	1	25		2,717		21		116		9		13		0		94		65		428
NE BLANCO UNIT #463	14319	NEBU	30N07W18	1	23		968		8		41		4		5		0		33		21		411
NE BLANCO UNIT #464	13577	NEBU	31N07W10	1	17		825		6		35		3		4		0		28		20		429
NE BLANCO UNIT #465	14320	NEBU	30N08W01	1	19		1,403		11		60		5		7		0		48		36		404
NE BLANCO UNIT #466	14321	NEBU	31N07W34	1	17		1,235		10		53		4		6		0		42		32		462
NE BLANCO UNIT #467	14322	NEBU	30N08W12	1	18		570		4		24		3		3		0		19		13		407
NE BLANCO UNIT #468	14323	NEBU	31N07W35	1	22		1,791		14		77		6		9		0		62		43		457
NE BLANCO UNIT #469	14324	NEBU	30N08W13	1	27		2,888		22		123		9		14		0		100		68		393
NE BLANCO UNIT #470	14352	NEBU	31N07W27	1	20		794		6		34		4		4		0		27		19		438
NE BLANCO UNIT #471	14325	NEBU	31N08W25	1	26		2,385		19		102		8		11		0		83		56		402
NE BLANCO UNIT #472	14326	NEBU	31N07W29	1	14		676		5		29		3		3		0		23		18		401
NE BLANCO UNIT #473	14327	NEBU	31N08W36	1	24		1,903		15		81		7		9		0		66		45		396
NE BLANCO UNIT #474	14353	NEBU	31N07W26	1	13		471		4		20		2		2		0		16		12		437
NE BLANCO UNIT #475	14328	NEBU	30N07W19	1	16		511		4		22		3		2		0		17		12		298
NE BLANCO UNIT #476	14329	NEBU	31N07W22	1	23		1,858		14		79		6		9		0		64		44		435
NE BLANCO UNIT #477	14379	NEBU	30N07W29	1	11		333		3		14		2		2		0		11		9		93
NE BLANCO UNIT #478	14330	NEBU	31N07W21	1	20		1,377		11		59		5		7		0		47		34		386
NE BLANCO UNIT #479R	13942	NEBU	30N07W20	1	26		1,350		10		58		5		6		0		46		30		334
NE BLANCO UNIT #480	14332	NEBU	31N07W14	1	24		1,773		14		76		6		8		0		61		42		463
NE BLANCO UNIT #481	14333	NEBU	31N07W36	1	16		745		6		32		3		4		0		25		19		86
NE BLANCO UNIT #482	14334	NEBU	31N07W15	1	24		2,520		20		108		8		12		0		88		61		439
NE BLANCO UNIT #483	14335	NEBU	31N07W36	1	13		534		4		23		2		3		0		18		14		85
NE BLANCO UNIT #484	14336	NEBU	31N07W16	1	14		370		3		16		2		2		0		12		9		430
NE BLANCO UNIT #485	14337	NEBU	30N07W03	1	16		900		7		38		4		4		0		31		23		131
NE BLANCO UNIT #486	14338	NEBU	31N06W19	1	21		2,251		18		96		7		11		0		78		56		472
NE BLANCO UNIT #487	14339	NEBU	31N07W35	1	30		2,968		23		127		10		14		0		103		66		464
NE BLANCO UNIT #488	14340	NEBU	31N07W24	1	19		2,214		17		95		7		11		0		77		57		458
NE BLANCO UNIT #489	14364	NEBU	31N07W12	1	12		293		2		13		2		1		0		9		7		456
NE BLANCO UNIT #490	14363	NEBU	31N07W14	1	18		1,215		9		52		4		6		0		42		31		434
NE BLANCO UNIT #491	14368	NEBU	31N07W25	1	17		678		5		29		3		3		0		23		16		152
NE BLANCO UNIT #492	14354	NEBU	31N07W12	1	21		1,465		11		63		5		7		0		50		36		453
NE BLANCO UNIT #493	14380	NEBU	31N07W25	1	17		770		6		33		3		4		0		26		19		143
NE BLANCO UNIT #494	14341	NEBU	31N07W27	1	22		1,030		8		44		4		5		0		35		24		465
NE BLANCO UNIT #495	14381	NEBU	31N06W30	1	20		1,113		9		48		4		5		0		38		27		144
NE BLANCO UNIT #496	14355	NEBU	31N06W18	1	16		1,237		10		53		4		6		0		43		32		459
NE BLANCO UNIT #497	14382	NEBU	31N06W30	1	22		1,113		9		48		5		5		0		38		26		146
NE BLANCO UNIT #498	14365	NEBU	31N07W13	1	19		1,467		11		63		5		7		0		51		37		460
NE BLANCO UNIT #499	14383	NEBU	31N06W20	1	28		1,738		14		74		7		8		0		59		38		179
NE BLANCO UNIT #500	14356	NEBU	31N06W20	1	27		1,755		14		75		7		8		0		60		39		454
NE BLANCO UNIT #504	14342	NEBU	31N07W16	1	20		1,289		10		55		5		6		0		44		32		513
NE BLANCO UNIT #505	14384	NEBU	30N07W21	1	28		1,580		12		68		6		8		0		54		34		319

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 12 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.		ADV&SEV				BFIT NET		10% DISC
					LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		TAXES		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS	YEARS	MMCF		MMCF		M$		M$		M$		M$		M$		M$		NUM
NORDHAUS #716	14360	NON-UNIT	31N09W13	1	26		2,051		149		820		77		91		0		652		435		549
PAYNE #201	14225	NON-UNIT	32N10W20	1	19		1,078		20		109		11		12		0		85		61		546
QUINN #336	14226	NON-UNIT	31N08W17	1	11		586		43		236		25		26		0		185		151		451
SAN JUAN 28-5 UNIT #219	13793	SJ 28-5	28N05W30	1	22		182		75		412		135		46		0		232		130		245
SAN JUAN 28-5 UNIT #223	13740	SJ 28-5	28N05W34	1	0		0		0		0		0		0		0		0		0		246
SAN JUAN 28-6 UNIT #400	13883	SJ 28-6	28N06W09	1	25		248		14		77		21		9		0		47		26		98
SAN JUAN 28-6 UNIT #404	14227	SJ 28-6	28N06W13	1	12		67		28		154		68		17		0		69		47		124
SAN JUAN 28-6 UNIT #405	13884	SJ 28-6	28N06W18	1	15		171		10		53		13		6		0		34		23		153
SAN JUAN 28-6 UNIT #406	13885	SJ 28-6	28N06W19	1	26		311		18		97		23		11		0		63		35		112
SAN JUAN 28-6 UNIT #410	14228	SJ 28-6	28N06W13	1	1		3		1		6		4		1		0		2		2		214
SAN JUAN 28-6 UNIT #414	13886	SJ 28-6	28N06W08	1	21		227		13		70		18		8		0		44		26		260
SAN JUAN 28-6 UNIT #418	13757	SJ 28-6	28N06W28	1	7		46		3		14		5		2		0		7		6		297
SAN JUAN 28-6 UNIT #421	13758	SJ 28-6	28N06W33	1	16		221		12		69		15		8		0		46		31		247
SAN JUAN 28-6 UNIT #436	14347	SJ 28-6	28N06W16	1	23		271		15		84		20		9		0		54		32		277
SAN JUAN 28-6 UNIT #437	14456	SJ 28-6	28N06W28	1	19		193		11		60		16		7		0		37		23		309
SAN JUAN 28-6 UNIT #438	14348	SJ 28-6	28N06W15	1	17		138		21		115		36		13		0		67		43		293
SAN JUAN 28-6 UNIT #439	14388	SJ 28-6	28N06W29	1	18		188		58		319		84		36		0		200		129		248
SAN JUAN 28-6 UNIT #440	13759	SJ 28-6	28N06W16	1	4		20		1		6		3		1		0		3		3		276
SAN JUAN 28-6 UNIT #441	14389	SJ 28-6	28N06W17	1	30		452		26		140		29		16		0		96		51		296
SAN JUAN 28-6 UNIT #448	13760	SJ 28-6	28N06W15	1	0		0		0		0		0		0		0		0		0		228
SAN JUAN 28-6 UNIT #449	13761	SJ 28-6	27N06W02	1	11		78		8		44		16		5		0		23		17		218
SAN JUAN 28-6 UNIT #455	13719	SJ 28-6	28N06W17	1	19		157		24		131		42		15		0		75		45		278
SAN JUAN 28-6 UNIT #456	14229	SJ 28-6	28N06W19	1	10		90		14		75		21		8		0		46		35		243
SAN JUAN 28-6 UNIT #457	13720	SJ 28-6	28N06W20	1	19		139		21		116		41		13		0		62		36		279
SAN JUAN 28-6 UNIT #458	14263	SJ 28-6	28N06W20	1	22		313		18		97		20		11		0		66		41		231
SAN JUAN 28-6 UNIT #459	13733	SJ 28-6	28N06W21	1	40		1,124		64		349		48		39		0		262		119		280
SAN JUAN 28-6 UNIT #460	13721	SJ 28-6	28N06W21	1	24		307		17		95		22		11		0		63		36		294
SAN JUAN 28-6 UNIT #461	13762	SJ 28-6	28N06W22	1	33		376		57		315		77		35		0		203		100		266
SAN JUAN 28-6 UNIT #462	13732	SJ 28-6	28N06W22	1	23		266		40		222		54		25		0		144		84		295
SAN JUAN 28-6 UNIT #467	13724	SJ 28-6	28N06W34	1	34		674		38		210		35		23		0		151		79		282
SAN JUAN 28-6 UNIT #474	13723	SJ 28-6	28N06W27	1	30		323		18		100		26		11		0		63		32		281
SAN JUAN 28-6 UNIT #475	13887	SJ 28-6	28N06W29	1	24		428		24		133		24		15		0		94		56		289
SAN JUAN 29-5 UNIT #203	13547	SJ 29-5	29N05W06	1	17		874		113		620		65		69		0		486		362		122
SAN JUAN 29-5 UNIT #213	13597	SJ 29-5	29N05W22	1	38		760		98		540		91		60		0		389		193		136
SAN JUAN 29-5 UNIT #219	14398	SJ 29-5	29N05W04	1	23		510		66		362		57		40		0		264		167		304
SAN JUAN 29-5 UNIT #223	13653	SJ 29-5	29N05W33	1	3		13		2		9		4		1		0		4		4		241
SAN JUAN 29-5 UNIT #225	14391	SJ 29-5	29N05W06	1	14		246		32		175		32		19		0		124		91		305
SAN JUAN 29-5 UNIT #226	14392	SJ 29-5	29N05W07	1	27		744		96		528		74		59		0		396		240		302
SAN JUAN 29-5 UNIT #230	14405	SJ 29-5	29N05W05	1	26		1,051		136		746		87		83		0		576		364		326
SAN JUAN 29-5 UNIT #231	14393	SJ 29-5	29N05W05	1	0		1		0		0		0		0		0		0		0		301
SAN JUAN 29-6 UNIT #201	13589	SJ 29-6	29N06W06	1	26		2,205		267		1,466		132		163		0		1,171		780		132
SAN JUAN 29-6 UNIT #202	13654	SJ 29-6	29N06W06	1	18		759		92		504		57		56		0		391		284		235
SAN JUAN 29-6 UNIT #203	13684	SJ 29-6	29N06W07	1	17		1,030		125		685		68		76		0		540		400		180

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 13 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.		ADV&SEV				BFIT NET		10% DISC
					LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		TAXES		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS	YEARS	MMCF		MMCF		M$		M$		M$		M$		M$		M$		NUM
SAN JUAN 29-6 UNIT #204	13655	SJ 29-6	29N06W07	1	6		84		10		56		12		6		0		38		33		207
SAN JUAN 29-6 UNIT #205	13685	SJ 29-6	29N06W21	1	22		1,331		161		885		88		98		0		698		480		250
SAN JUAN 29-6 UNIT #206	13548	SJ 29-6	29N06W04	1	26		1,057		128		703		82		78		0		542		341		117
SAN JUAN 29-6 UNIT #207	13549	SJ 29-6	29N06W02	1	17		1,011		122		672		67		75		0		530		394		115
SAN JUAN 29-6 UNIT #208	13587	SJ 29-6	29N06W17	1	20		1,389		168		924		87		103		0		734		529		133
SAN JUAN 29-6 UNIT #209	13588	SJ 29-6	29N06W17	1	18		807		98		537		59		60		0		418		302		126
SAN JUAN 29-6 UNIT #210	14394	SJ 29-6	29N06W20	1	30		2,698		326		1,794		157		199		0		1,437		925		182
SAN JUAN 29-6 UNIT #211	14395	SJ 29-6	29N06W20	1	27		1,224		148		814		90		90		0		634		401		174
SAN JUAN 29-6 UNIT #213	13590	SJ 29-6	29N06W30	1	11		92		11		61		18		7		0		36		27		127
SAN JUAN 29-6 UNIT #214	13595	SJ 29-6	29N06W03	1	6		146		18		97		15		11		0		72		63		137
SAN JUAN 29-6 UNIT #215	13599	SJ 29-6	29N06W03	1	16		561		68		373		46		41		0		285		209		175
SAN JUAN 29-6 UNIT #216	13596	SJ 29-6	29N06W04	1	14		459		56		305		39		34		0		233		178		138
SAN JUAN 29-6 UNIT #217	13612	SJ 29-6	29N06W05	1	26		2,531		306		1,683		145		187		0		1,351		919		193
SAN JUAN 29-6 UNIT #218	13605	SJ 29-6	29N06W05	1	12		524		63		348		39		39		0		271		216		181
SAN JUAN 29-6 UNIT #219	13593	SJ 29-6	29N06W10	1	22		1,048		127		697		75		77		0		544		373		139
SAN JUAN 29-6 UNIT #220	13600	SJ 29-6	29N06W11	1	18		497		60		331		47		37		0		247		171		165
SAN JUAN 29-6 UNIT #221	13601	SJ 29-6	29N06W11	1	20		916		111		609		67		68		0		474		333		159
SAN JUAN 29-6 UNIT #222	13718	SJ 29-6	29N06W12	1	32		1,253		152		833		99		93		0		642		371		183
SAN JUAN 29-6 UNIT #223	13611	SJ 29-6	29N06W12	1	28		1,585		192		1,054		107		117		0		830		524		160
SAN JUAN 29-6 UNIT #224	13696	SJ 29-6	29N06W13	1	0		0		0		0		0		0		0		0		0		184
SAN JUAN 29-6 UNIT #225R	13947	SJ 29-6	29N06W13	1	1		4		1		3		2		0		0		1		1		332
SAN JUAN 29-6 UNIT #226	14396	SJ 29-6	29N06W14	1	35		4,077		493		2,711		224		301		0		2,186		1,354		154
SAN JUAN 29-6 UNIT #227	13765	SJ 29-6	29N06W14	1	0		0		0		0		0		0		0		0		0		155
SAN JUAN 29-6 UNIT #229	13766	SJ 29-6	29N06W35	1	19		243		29		162		37		18		0		106		67		162
SAN JUAN 29-6 UNIT #230	13602	SJ 29-6	29N06W35	1	19		210		8		43		11		5		0		27		17		140
SAN JUAN 29-6 UNIT #231	13594	SJ 29-6	29N06W36	1	4		19		3		16		7		2		0		7		6		141
SAN JUAN 29-6 UNIT #233	13767	SJ 29-6	29N06W26	1	16		225		26		140		30		16		0		95		64		176
SAN JUAN 29-6 UNIT #235	14513	SJ 29-6	29N06W34	1	33		471		57		313		65		35		0		213		108		208
SAN JUAN 29-6 UNIT #236	13694	SJ 29-6	29N06W18	1	25		1,149		139		764		84		85		0		595		385		177
SAN JUAN 29-6 UNIT #237	13674	SJ 29-6	29N06W01	1	19		708		86		471		57		52		0		362		252		197
SAN JUAN 29-6 UNIT #238	13675	SJ 29-6	29N06W01	1	14		448		54		298		38		33		0		227		173		198
SAN JUAN 29-6 UNIT #239	13676	SJ 29-6	29N06W02	1	15		647		78		430		49		48		0		334		252		170
SAN JUAN 29-6 UNIT #240	13686	SJ 29-6	29N06W18	1	23		1,531		185		1,018		98		113		0		807		554		251
SAN JUAN 29-6 UNIT #241	13687	SJ 29-6	29N06W19	1	31		1,817		220		1,208		121		134		0		953		583		252
SAN JUAN 29-6 UNIT #242	13688	SJ 29-6	29N06W19	1	27		1,420		172		944		99		105		0		740		470		178
SAN JUAN 29-6 UNIT #243	13768	SJ 29-6	29N06W31	1	22		197		7		40		12		4		0		24		14		255
SAN JUAN 29-6 UNIT #245	13667	SJ 29-6	29N06W08	1	21		1,063		129		707		75		79		0		554		386		242
SAN JUAN 29-6 UNIT #246	14397	SJ 29-6	29N06W08	1	5		35		4		23		9		3		0		12		10		209
SAN JUAN 29-6 UNIT #247R	13814	SJ 29-6	29N06W10	1	17		392		47		261		41		29		0		191		134		338
SAN JUAN 29-6 UNIT #249	13796	SJ 29-6	29N06W22	1	8		50		6		33		13		4		0		17		13		323
SAN JUAN 29-6 UNIT #251	13803	SJ 29-6	29N06W23	1	8		42		6		34		16		4		0		15		11		317
SAN JUAN 29-6 UNIT #257R	13815	SJ 29-6	29N06W09	1	25		1,082		131		719		82		80		0		558		358		339
SAN JUAN 29-6 UNIT #258	13695	SJ 29-6	29N06W16	1	25		1,710		207		1,137		108		126		0		902		607		186

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 14 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.		ADV&SEV				BFIT NET		10% DISC
					LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		TAXES		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS	YEARS	MMCF		MMCF		M$		M$		M$		M$		M$		M$		NUM
SAN JUAN 29-6 UNIT #259	14399	SJ 29-6	29N06W09	1	11		273		33		181		27		20		0		134		106		185
SAN JUAN 29-6 UNIT #260	14400	SJ 29-6	29N06W16	1	16		276		33		184		33		20		0		130		91		187
SAN JUAN 29-6 UNIT #262	14401	SJ 29-6	29N06W21	1	30		2,122		257		1,411		133		157		0		1,121		704		307
SAN JUAN 29-6 UNIT #263	13802	SJ 29-6	29N06W22	1	6		48		7		39		14		4		0		21		17		320
SAN JUAN 29-6 UNIT #264	13841	SJ 29-6	29N06W27	1	9		56		7		37		15		4		0		18		14		341
SAN JUAN 29-7 UNIT #507R	12667	SJ 29-7	29N07W13	1	31		1,867		188		1,036		100		115		0		821		503		330
SAN JUAN 29-7 UNIT #520	12524	SJ 29-7	29N07W08	1	16		229		23		127		26		14		0		87		59		342
SAN JUAN 29-7 UNIT #521	12653	SJ 29-7	29N07W13	1	26		1,554		157		862		84		96		0		682		443		221
SAN JUAN 29-7 UNIT #530	13882	SJ 29-7	29N07W34	1	26		401		41		223		43		25		0		155		89		195
SAN JUAN 29-7 UNIT #532	14349	SJ 29-7	29N07W02	1	16		306		31		170		29		19		0		122		85		145
SAN JUAN 29-7 UNIT #533	14464	SJ 29-7	29N07W03	1	9		140		14		78		14		9		0		55		45		196
SAN JUAN 29-7 UNIT #534	12668	SJ 29-7	29N07W09	1	16		454		46		252		34		28		0		189		136		327
SAN JUAN 29-7 UNIT #537	12669	SJ 29-7	29N07W22	1	7		91		9		51		11		6		0		34		28		290
SAN JUAN 29-7 UNIT #538	14402	SJ 29-7	29N07W26	1	23		454		46		252		42		28		0		182		113		200
SAN JUAN 29-7 UNIT #540	12654	SJ 29-7	29N07W10	1	14		253		25		140		24		16		0		101		74		284
SAN JUAN 29-7 UNIT #543	12655	SJ 29-7	29N07W03	1	35		1,081		109		599		76		67		0		456		249		299
SAN JUAN 29-7 UNIT #544	12656	SJ 29-7	29N07W04	1	31		2,321		234		1,287		116		143		0		1,028		637		283
SAN JUAN 29-7 UNIT #545	12657	SJ 29-7	29N07W12	1	30		2,337		236		1,296		116		144		0		1,036		652		210
SAN JUAN 29-7 UNIT #547	14403	SJ 29-7	29N07W07	1	26		597		60		331		50		37		0		244		145		291
SAN JUAN 29-7 UNIT #548	14372	SJ 29-7	29N07W07	1	37		636		64		353		63		39		0		250		122		300
SAN JUAN 29-7 UNIT #550	12659	SJ 29-7	29N07W11	1	18		769		78		426		46		47		0		333		241		215
SAN JUAN 29-7 UNIT #552	12652	SJ 29-7	29N07W12	1	21		1,781		180		988		86		110		0		792		566		314
SAN JUAN 29-7 UNIT #553	12661	SJ 29-7	29N07W14	1	25		2,450		247		1,359		113		151		0		1,095		756		234
SAN JUAN 29-7 UNIT #554	12662	SJ 29-7	29N07W14	1	20		459		301		1,656		244		184		0		1,228		821		201
SAN JUAN 29-7 UNIT #559	14404	SJ 29-7	29N07W22	1	16		180		18		100		24		11		0		64		43		244
SAN JUAN 29-7 UNIT #562	12664	SJ 29-7	29N07W24	1	26		1,833		185		1,017		93		113		0		810		534		239
SAN JUAN 29-7 UNIT #563	12665	SJ 29-7	29N07W24	1	5		37		16		90		29		10		0		51		44		285
SAN JUAN 29-7 UNIT #565	14231	SJ 29-7	29N07W26	1	15		94		62		339		126		38		0		176		114		203
SAN JUAN 29-7 UNIT #577	14232	SJ 29-7	29N07W35	1	9		75		6		30		10		3		0		17		13		275
SAN JUAN 29-7 UNIT #580	14465	SJ 29-7	29N07W01	1	12		617		62		342		35		38		0		269		215		219
SAN JUAN 29-7 UNIT #582	12666	SJ 29-7	29N07W02	1	18		1,548		156		858		74		95		0		689		513		211
SAN JUAN 29-7 UNIT #583	12670	SJ 29-7	29N07W06	1	13		230		23		128		23		14		0		91		67		329
SAN JUAN 29-7 UNIT #92R	12025	SJ 29-7	29N07W16	1	4		38		4		21		5		2		0		14		12		1248
SAN JUAN 30-5 UNIT #201	13550	SJ 30-5	30N05W19	1	27		1,956		333		1,833		171		204		0		1,458		956		123
SAN JUAN 30-5 UNIT #202	13551	SJ 30-5	30N05W06	1	22		1,726		256		1,409		131		157		0		1,121		790		116
SAN JUAN 30-5 UNIT #203	13607	SJ 30-5	30N05W06	1	3		19		3		18		6		2		0		9		9		156
SAN JUAN 30-5 UNIT #204	13726	SJ 30-5	30N05W07	1	20		425		72		398		65		44		0		289		190		163
SAN JUAN 30-5 UNIT #205	13772	SJ 30-5	30N05W07	1	13		282		48		264		43		29		0		191		143		148
SAN JUAN 30-5 UNIT #206	13711	SJ 30-5	30N05W18	1	21		869		148		814		94		91		0		630		428		166
SAN JUAN 30-5 UNIT #207	13727	SJ 30-5	30N05W18	1	16		860		147		806		83		90		0		633		475		192
SAN JUAN 30-5 UNIT #208	13665	SJ 30-5	30N05W19	1	19		1,672		285		1,566		137		174		0		1,255		931		199
SAN JUAN 30-5 UNIT #209	13606	SJ 30-5	30N05W30	1	20		1,187		202		1,112		111		124		0		877		624		167
SAN JUAN 30-5 UNIT #210	13682	SJ 30-5	30N05W30	1	15		565		96		529		63		59		0		408		307		264

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 15 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

											REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF		MMCF		M$		M$		TAXEX M$		M$		M$		M$		NUM
SAN JUAN 30-5 UNIT #211	13683	SJ 30-5	30N05W31		1	18		703		120		659		78		73		0		508		360		172
SAN JUAN 30-5 UNIT #212	13617	SJ 30-5	30N05W31		1	18		672		115		629		76		70		0		484		344		173
SAN JUAN 30-5 UNIT #213R	16986	SJ 30-5	30N05W05		1	14		687		117		644		70		72		0		503		385		624
SAN JUAN 30-5 UNIT #214	16987	SJ 30-5	30N05W05		1	16		1,244		212		1,165		107		130		0		929		711		638
SAN JUAN 30-5 UNIT #215	13660	SJ 30-5	30N05W08		1	23		1,545		1,352		7,430		680		826		0		5,924		4,093		190
SAN JUAN 30-5 UNIT #216R	13943	SJ 30-5	30N05W20		1	14		438		75		410		54		46		0		310		233		335
SAN JUAN 30-5 UNIT #217	13614	SJ 30-5	30N05W21		1	24		1,523		260		1,427		139		159		0		1,130		761		217
SAN JUAN 30-5 UNIT #218	13659	SJ 30-5	30N05W17		1	21		2,407		410		2,255		186		251		0		1,819		1,335		191
SAN JUAN 30-5 UNIT #219R	17250	SJ 30-5	30N05W16		1	9		298		51		279		35		31		0		213		178		625
SAN JUAN 30-5 UNIT #220R	15532	SJ 30-5	30N05W08		1	20		833		142		780		88		87		0		605		425		635
SAN JUAN 30-5 UNIT #223	13677	SJ 30-5	30N05W20		1	23		1,444		246		1,353		133		150		0		1,070		726		236
SAN JUAN 30-5 UNIT #224	12576	SJ 30-5	30N05W17		1	17		520		89		487		64		54		0		369		263		237
SAN JUAN 30-5 UNIT #225	14406	SJ 30-5	30N05W29		1	14		316		54		297		46		33		0		218		162		306
SAN JUAN 30-5 UNIT #226	13670	SJ 30-5	30N05W29		1	16		817		139		766		81		85		0		600		447		261
SAN JUAN 30-5 UNIT #226A	5772	SJ 30-5	30N05W29		1	17		744		127		697		78		77		0		541		396		983
SAN JUAN 30-5 UNIT #227	13672	SJ 30-5	30N05W28		1	23		924		158		866		101		96		0		669		441		232
SAN JUAN 30-5 UNIT #228	14407	SJ 30-5	30N05W28		1	15		411		70		385		54		43		0		289		213		310
SAN JUAN 30-5 UNIT #229	13673	SJ 30-5	30N05W21		1	29		2,026		345		1,898		178		211		0		1,509		967		270
SAN JUAN 30-5 UNIT #230	14366	SJ 30-5	30N05W32		1	7		197		34		185		26		21		0		138		117		238
SAN JUAN 30-5 UNIT #231	14409	SJ 30-5	30N05W32		1	21		551		94		516		73		57		0		386		257		233
SAN JUAN 30-5 UNIT #232	14408	SJ 30-5	30N05W33		1	6		57		10		54		15		6		0		33		27		321
SAN JUAN 30-5 UNIT #233	14443	SJ 30-5	30N05W33		1	24		784		134		735		94		82		0		559		358		322
SAN JUAN 30-5 UNIT #234	14410	SJ 30-5	30N05W22		1	34		3,387		577		3,174		271		353		0		2,549		1,565		318
SAN JUAN 30-5 UNIT #235	14411	SJ 30-5	30N05W27		1	16		513		87		481		61		53		0		366		269		311
SAN JUAN 30-5 UNIT #236	14412	SJ 30-5	30N05W27		1	7		258		44		242		30		27		0		185		159		303
SAN JUAN 30-5 UNIT #237	14413	SJ 30-5	30N05W16		1	0		0		0		0		0		0		0		0		0		308
SAN JUAN 30-5 UNIT #237R	6123	SJ 30-5	30N05W16		1	7		452		232		1,272		117		141		0		1,014		886		1201
SAN JUAN 30-5 UNIT #238	14414	SJ 30-5	30N05W34		1	12		406		69		380		49		42		0		290		225		312
SAN JUAN 30-5 UNIT #239	13949	SJ 30-5	30N05W15		1	12		380		65		356		46		40		0		270		212		315
SAN JUAN 30-5 UNIT #240	14415	SJ 30-5	30N05W22		1	29		2,493		425		2,336		207		260		0		1,870		1,214		324
SAN JUAN 30-5 UNIT #241	14416	SJ 30-5	30N05W23		1	15		336		57		314		50		35		0		229		164		325
SAN JUAN 30-5 UNIT #242	14444	SJ 30-5	30N05W34		1	4		41		7		39		11		4		0		23		21		316
SAN JUAN 30-5 UNIT #243	14069	SJ 30-5	30N05W15		1	32		1,895		323		1,775		178		197		0		1,400		839		346
SAN JUAN 30-5 UNIT #246	13948	SJ 30-5	30N05W26		1	18		615		105		576		72		64		0		441		313		331
SAN JUAN 30-5 UNIT #249	14068	SJ 30-5	30N05W23		1	17		771		131		723		79		80		0		563		414		632
SAN JUAN 30-5 UNIT #255	13842	SJ 30-5	30N05W14		1	21		936		160		877		98		97		0		681		464		340
SAN JUAN 30-5 UNIT #257	14025	SJ 30-5	30N05W11		1	22		1,766		301		1,655		149		184		0		1,322		938		345
SAN JUAN 30-5 UNIT #258	14026	SJ 30-5	30N05W14		1	31		3,307		564		3,099		261		344		0		2,493		1,591		344
SAN JUAN 30-5 UNIT #259	8011	SJ 30-5	30N05W13		1	18		854		146		800		87		89		0		625		452		630
SAN JUAN 30-5 UNIT #260	12646	SJ 30-5	30N05W09		1	10		1,241		212		1,163		94		129		0		939		802		633
SAN JUAN 30-5 UNIT #261	5424	SJ 30-5	30N05W11		1	20		1,020		174		956		101		106		0		748		525		682
SAN JUAN 30-5 UNIT #262	8012	SJ 30-5	30N05W12		1	9		422		72		396		43		44		0		309		260		631
SAN JUAN 30-5 UNIT #263	5425	SJ 30-5	30N05W13		1	16		837		143		784		81		87		0		616		467		683

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 16 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

											REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF		MMCF		M$		M$		TAXEX M$		M$		M$		M$		NUM
SAN JUAN 30-5 UNIT #264	12619	SJ 30-5	30N05W09		1	20		2,507		427		2,349		191		261		0		1,897		1,408		634
SAN JUAN 30-5 UNIT #265	15533	SJ 30-5	30N05W10		1	19		2,943		502		2,758		215		307		0		2,236		1,696		637
SAN JUAN 30-5 UNIT #266	15534	SJ 30-5	30N05W10		1	22		3,056		521		2,863		227		318		0		2,318		1,691		636
SAN JUAN 30-5 UNIT #267	5046	SJ 30-5	30N05W24		1	12		560		95		525		57		58		0		409		325		1246
SAN JUAN 30-5 UNIT #268	10177	SJ 30-5	30N05W24		1	15		557		95		522		64		58		0		400		297		1247
SAN JUAN 30-6 UNIT #467COM FRT.	4496	NEBU	30N07W22		1	13		459		13		72		9		8		0		55		43		105
SAN JUAN 30-6 UNIT #400	14164	SJ 30-6	30N07W14		1	19		1,475		74		405		37		45		0		323		237		23
SAN JUAN 30-6 UNIT #401R	14165	SJ 30-6	30N07W13		1	10		310		15		85		11		9		0		65		53		79
SAN JUAN 30-6 UNIT #403	13648	SJ 30-6	30N06W09		1	27		2,253		113		618		56		69		0		494		325		171
SAN JUAN 30-6 UNIT #404R	14459	SJ 30-6	30N07W23		1	24		2,561		128		703		59		78		0		566		395		328
SAN JUAN 30-6 UNIT #405	13580	SJ 30-6	30N06W09		1	18		696		35		191		23		21		0		147		105		128
SAN JUAN 30-6 UNIT #406R	14167	SJ 30-6	30N07W15		1	19		1,026		51		281		29		31		0		221		159		108
SAN JUAN 30-6 UNIT #407	13559	SJ 30-6	30N06W16		1	24		1,931		96		530		48		59		0		423		289		120
SAN JUAN 30-6 UNIT #408	13558	SJ 30-6	30N06W16		1	24		1,720		86		472		44		52		0		375		256		119
SAN JUAN 30-6 UNIT #409	14168	SJ 30-6	30N07W25		1	24		2,607		130		715		60		80		0		576		402		30
SAN JUAN 30-6 UNIT #410	14211	SJ 30-6	30N06W26		1	19		946		47		260		28		29		0		203		145		135
SAN JUAN 30-6 UNIT #411	14169	SJ 30-6	30N07W27		1	11		272		14		75		11		8		0		55		44		33
SAN JUAN 30-6 UNIT #412	14170	SJ 30-6	30N07W24		1	25		2,523		126		692		59		77		0		556		382		24
SAN JUAN 30-6 UNIT #413R	14171	SJ 30-6	30N07W23		1	24		1,905		95		523		47		58		0		417		288		84
SAN JUAN 30-6 UNIT #414	14172	SJ 30-6	30N07W35		1	11		267		13		73		11		8		0		54		43		25
SAN JUAN 30-6 UNIT #415	14173	SJ 30-6	30N07W26		1	25		1,989		99		546		49		61		0		436		297		32
SAN JUAN 30-6 UNIT #416	14174	SJ 30-6	30N07W24		1	25		2,968		148		814		67		91		0		657		459		28
SAN JUAN 30-6 UNIT #417	14175	SJ 30-6	30N07W25		1	21		1,523		76		418		39		46		0		333		238		29
SAN JUAN 30-6 UNIT #418	14176	SJ 30-6	30N07W26		1	28		2,697		135		740		64		82		0		594		395		31
SAN JUAN 30-6 UNIT #419	14177	SJ 30-6	30N07W11		1	14		503		25		138		17		15		0		106		81		26
SAN JUAN 30-6 UNIT #420	14178	SJ 30-6	30N07W12		1	21		859		43		236		27		26		0		182		125		27
SAN JUAN 30-6 UNIT #421	14179	SJ 30-6	30N07W34		1	2		9		0		2		1		0		0		1		1		37
SAN JUAN 30-6 UNIT #422	14264	SJ 30-6	30N07W27		1	23		915		46		251		29		28		0		194		128		59
SAN JUAN 30-6 UNIT #423	14462	SJ 30-6	30N07W28		1	6		81		4		22		5		2		0		15		13		95
SAN JUAN 30-6 UNIT #424	14463	SJ 30-6	30N07W33		1	16		460		23		126		17		14		0		95		70		56
SAN JUAN 30-6 UNIT #425	14385	SJ 30-6	30N07W33		1	19		1,095		55		301		30		33		0		237		171		47
SAN JUAN 30-6 UNIT #426	14180	SJ 30-6	30N07W34		1	11		207		10		57		10		6		0		41		32		54
SAN JUAN 30-6 UNIT #427	14181	SJ 30-6	30N07W35		1	15		647		32		178		20		20		0		138		104		60
SAN JUAN 30-6 UNIT #428	14358	SJ 30-6	30N07W28		1	28		1,445		72		396		42		44		0		311		195		82
SAN JUAN 30-6 UNIT #429	14359	SJ 30-6	30N07W32		1	7		102		5		28		6		3		0		19		16		67
SAN JUAN 30-6 UNIT #430	13543	SJ 30-6	30N06W08		1	16		1,050		52		288		27		32		0		229		175		38
SAN JUAN 30-6 UNIT #431	13544	SJ 30-6	30N06W10		1	12		769		38		211		21		23		0		167		134		40
SAN JUAN 30-6 UNIT #432	13545	SJ 30-6	30N06W10		1	26		1,625		81		446		43		50		0		353		233		39
SAN JUAN 30-6 UNIT #433	14182	SJ 30-6	30N06W11		1	19		1,052		53		289		29		32		0		227		165		48
SAN JUAN 30-6 UNIT #434	14183	SJ 30-6	30N06W12		1	21		1,556		78		427		40		47		0		340		242		58
SAN JUAN 30-6 UNIT #435	14184	SJ 30-6	30N06W13		1	22		1,177		59		323		33		36		0		254		175		70
SAN JUAN 30-6 UNIT #436	14185	SJ 30-6	30N06W15		1	20		1,497		75		411		38		46		0		327		238		41
SAN JUAN 30-6 UNIT #437	14186	SJ 30-6	30N06W11		1	30		2,275		114		624		57		69		0		498		316		62

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 17 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

											REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF		MMCF		M$		M$		TAXEX M$		M$		M$		M$		NUM
SAN JUAN 30-6 UNIT #438	14187	SJ 30-6	30N06W12		1	22		1,835		92		504		45		56		0		403		287		68
SAN JUAN 30-6 UNIT #439	14188	SJ 30-6	30N06W14		1	24		1,287		64		353		37		39		0		277		185		49
SAN JUAN 30-6 UNIT #440	14189	SJ 30-6	30N06W15		1	6		75		4		21		5		2		0		14		12		50
SAN JUAN 30-6 UNIT #441	14190	SJ 30-6	30N06W31		1	2		25		1		7		2		1		0		4		4		53
SAN JUAN 30-6 UNIT #442	13568	SJ 30-6	30N06W14		1	23		1,726		86		474		44		53		0		377		260		96
SAN JUAN 30-6 UNIT #443	13532	SJ 30-6	30N06W36		1	4		23		1		6		3		1		0		3		3		69
SAN JUAN 30-6 UNIT #444	14208	SJ 30-6	30N06W36		1	29		1,637		82		449		45		50		0		354		222		66
SAN JUAN 30-6 UNIT #445	14209	SJ 30-6	30N06W13		1	23		1,530		76		420		40		47		0		333		228		73
SAN JUAN 30-6 UNIT #446	14204	SJ 30-6	30N06W35		1	23		2,157		108		592		51		66		0		475		333		129
SAN JUAN 30-6 UNIT #447	14206	SJ 30-6	30N07W31		1	14		377		19		103		15		11		0		77		57		147
SAN JUAN 30-6 UNIT #450	13536	SJ 30-6	30N06W07		1	22		1,407		70		386		37		43		0		306		214		43
SAN JUAN 30-6 UNIT #451	13534	SJ 30-6	30N06W07		1	20		1,709		85		469		42		52		0		375		273		42
SAN JUAN 30-6 UNIT #452	13535	SJ 30-6	30N06W08		1	20		1,249		62		343		33		38		0		271		195		61
SAN JUAN 30-6 UNIT #453	14191	SJ 30-6	30N06W17		1	21		1,176		59		323		33		36		0		254		177		57
SAN JUAN 30-6 UNIT #454	14192	SJ 30-6	30N06W17		1	25		2,092		104		574		51		64		0		459		313		44
SAN JUAN 30-6 UNIT #455	14161	SJ 30-6	30N06W18		1	21		1,153		58		316		33		35		0		249		172		52
SAN JUAN 30-6 UNIT #456	13537	SJ 30-6	30N06W18		1	23		2,357		118		647		55		72		0		520		368		51
SAN JUAN 30-6 UNIT #457	14193	SJ 30-6	30N06W19		1	23		2,034		102		558		49		62		0		447		311		45
SAN JUAN 30-6 UNIT #458	14194	SJ 30-6	30N06W19		1	19		1,016		51		279		29		31		0		219		156		63
SAN JUAN 30-6 UNIT #459	14195	SJ 30-6	30N06W20		1	24		1,678		84		460		43		51		0		366		250		64
SAN JUAN 30-6 UNIT #460	14162	SJ 30-6	30N06W20		1	20		1,445		72		396		37		44		0		315		227		55
SAN JUAN 30-6 UNIT #461	14251	SJ 30-6	30N07W11		1	17		613		31		168		21		19		0		129		93		80
SAN JUAN 30-6 UNIT #462	14196	SJ 30-6	30N07W12		1	31		1,640		82		450		47		50		0		353		213		83
SAN JUAN 30-6 UNIT #463	14197	SJ 30-6	30N07W13		1	11		304		15		83		12		9		0		63		50		81
SAN JUAN 30-6 UNIT #464	14198	SJ 30-6	30N07W14		1	21		806		40		221		26		25		0		171		117		46
SAN JUAN 30-6 UNIT #465	14199	SJ 30-6	30N07W15		1	21		1,230		61		338		34		38		0		266		187		65
SAN JUAN 30-6 UNIT #466	14200	SJ 30-6	30N07W22		1	14		559		28		153		18		17		0		119		92		75
SAN JUAN 30-6 UNIT #468	14252	SJ 30-6	30N07W36		1	29		2,843		142		780		67		87		0		626		407		91
SAN JUAN 30-6 UNIT #470	14253	SJ 30-6	30N06W21		1	22		1,449		72		398		38		44		0		315		220		102
SAN JUAN 30-6 UNIT #471	14254	SJ 30-6	30N06W21		1	20		1,374		69		377		36		42		0		299		215		113
SAN JUAN 30-6 UNIT #472	14255	SJ 30-6	30N06W22		1	20		632		32		173		22		19		0		132		90		107
SAN JUAN 30-6 UNIT #473	14256	SJ 30-6	30N06W22		1	18		907		45		249		27		28		0		195		141		106
SAN JUAN 30-6 UNIT #474	14257	SJ 30-6	30N06W27		1	26		2,210		110		607		54		67		0		485		325		97
SAN JUAN 30-6 UNIT #475	14258	SJ 30-6	30N06W27		1	30		3,153		157		865		73		96		0		696		453		109
SAN JUAN 30-6 UNIT #476	14163	SJ 30-6	30N06W28		1	23		1,592		79		437		41		49		0		347		240		100
SAN JUAN 30-6 UNIT #477	14210	SJ 30-6	30N06W28		1	28		2,686		134		737		64		82		0		591		389		111
SAN JUAN 30-6 UNIT #478	14205	SJ 30-6	30N06W29		1	24		2,031		101		557		50		62		0		446		307		101
SAN JUAN 30-6 UNIT #479	14259	SJ 30-6	30N06W29		1	24		1,554		78		426		41		47		0		338		230		134
SAN JUAN 30-6 UNIT #480	14260	SJ 30-6	30N06W30		1	17		866		43		238		25		26		0		186		137		110
SAN JUAN 30-6 UNIT #481	14261	SJ 30-6	30N06W30		1	28		2,813		140		772		66		86		0		620		409		99
SAN JUAN 30-6 UNIT #482	14266	SJ 30-6	30N06W31		1	29		2,663		133		731		64		81		0		586		379		142
SAN JUAN 30-6 UNIT #483	14207	SJ 30-6	30N06W34		1	20		870		43		239		27		27		0		185		128		104
SAN JUAN 30-6 UNIT #484	14249	SJ 30-6	30N06W34		1	20		802		40		220		25		24		0		170		119		103

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 18 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

											REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF		MMCF		M$		M$		TAXEX M$		M$		M$		M$		NUM
SAN JUAN 30-6 UNIT #485	14233	SJ 30-6	30N07W36		1	18		1,259		63		345		32		38		0		275		205		204
SAN JUAN 30-6 UNIT #486	14234	SJ 30-6	30N06W23		1	23		1,782		89		489		45		54		0		390		270		271
SAN JUAN 30-6 UNIT #487	14235	SJ 30-6	30N06W23		1	24		1,767		88		485		45		54		0		386		262		292
SAN JUAN 30-6 UNIT #488	14236	SJ 30-6	30N06W24		1	16		455		23		125		17		14		0		94		67		222
SAN JUAN 30-6 UNIT #489	14237	SJ 30-6	30N06W24		1	18		1,118		56		307		30		34		0		242		177		249
SAN JUAN 30-6 UNIT #490	14238	SJ 30-6	30N06W25		1	14		569		28		156		18		17		0		121		92		223
SAN JUAN 30-6 UNIT #491	14239	SJ 30-6	30N06W25		1	19		1,153		58		316		31		35		0		250		180		224
SAN JUAN 30-6 UNIT #492	14240	SJ 30-6	30N06W26		1	14		513		26		141		17		16		0		108		82		230
SAN JUAN 30-6 UNIT #493	14241	SJ 30-6	30N06W32		1	14		595		30		163		19		18		0		127		97		205
SAN JUAN 30-6 UNIT #494	14242	SJ 30-6	30N06W33		1	31		3,438		172		943		79		105		0		760		486		212
SAN JUAN 30-6 UNIT #495	14243	SJ 30-6	30N06W33		1	25		1,769		88		485		45		54		0		386		261		213
SAN JUAN 30-6 UNIT #496	14244	SJ 30-6	30N06W35		1	18		594		30		163		21		18		0		124		87		225
SAN JUAN 30-6 UNIT #497	14245	SJ 30-6	30N07W29		1	27		776		39		213		29		24		0		160		98		259
SAN JUAN 30-6 UNIT #498R	13946	SJ 30-6	30N07W30		1	5		38		6		31		11		3		0		16		14		336
SAN JUAN 30-6 UNIT #499	14247	SJ 30-6	30N07W30		1	1		4		0		1		1		0		0		0		0		258
SAN JUAN 30-6 UNIT #500	14417	SJ 30-6	30N07W31		1	21		306		45		249		53		28		0		168		104		240
SAN JUAN 30-6 UNIT #501	14248	SJ 30-6	30N06W32		1	20		1,285		64		353		34		39		0		279		199		206
SAN JUAN 31 FED 3 #2	14418	NON-UNIT	31N09W03		1	26		1,618		240		1,321		132		147		0		1,042		688		559
SAN JUAN 31-6 UNIT #201	13540	SJ 31-6	30N06W01		1	25		1,057		113		622		72		69		0		481		311		130
SAN JUAN 31-6 UNIT #202	13552	SJ 31-6	30N06W01		1	33		2,640		283		1,554		144		173		0		1,238		756		118
SAN JUAN 31-6 UNIT #203	13539	SJ 31-6	30N06W03		1	13		337		36		198		29		22		0		147		113		88
SAN JUAN 31-6 UNIT #204	13541	SJ 31-6	30N06W03		1	22		1,599		171		941		90		105		0		747		521		90
SAN JUAN 31-6 UNIT #205R	12574	SJ 31-6	30N06W04		1	4		40		4		24		6		3		0		15		13		343
SAN JUAN 31-6 UNIT #206	13542	SJ 31-6	30N06W04		1	10		437		47		257		29		29		0		199		164		92
SAN JUAN 31-6 UNIT #207	13533	SJ 31-6	30N06W06		1	20		707		76		416		52		46		0		318		219		94
SAN JUAN 31-6 UNIT #208	14213	SJ 31-6	30N06W06		1	17		422		45		248		38		28		0		183		128		89
SAN JUAN 31-6 UNIT #209	14214	SJ 31-6	30N07W01		1	10		225		24		132		21		15		0		97		78		87
SAN JUAN 31-6 UNIT #210	13618	SJ 31-6	30N06W02		1	20		1,365		146		803		78		89		0		636		458		168
SAN JUAN 31-6 UNIT #211	13553	SJ 31-6	30N06W02		1	26		1,977		212		1,164		109		129		0		925		616		114
SAN JUAN 31-6 UNIT #212	13615	SJ 31-6	30N06W05		1	12		630		68		371		40		41		0		290		230		164
SAN JUAN 31-6 UNIT #213	13554	SJ 31-6	30N06W05		1	17		855		92		503		55		56		0		393		289		121
SAN JUAN 31-6 UNIT #214	13646	SJ 31-6	31N06W36		1	14		445		48		262		34		29		0		199		151		254
SAN JUAN 31-6 UNIT #215	13616	SJ 31-6	31N06W36		1	21		857		92		504		59		56		0		389		268		150
SAN JUAN 31-6 UNIT #216	13647	SJ 31-6	31N06W35		1	22		786		84		463		58		51		0		353		236		287
SAN JUAN 31-6 UNIT #217	13609	SJ 31-6	31N06W35		1	11		263		28		155		23		17		0		114		91		157
SAN JUAN 31-6 UNIT #218	13671	SJ 31-6	31N06W34		1	16		453		48		266		37		30		0		199		144		265
SAN JUAN 31-6 UNIT #219	13608	SJ 31-6	31N06W34		1	31		1,894		203		1,115		112		124		0		879		538		158
SAN JUAN 31-6 UNIT #220R	18278	SJ 31-6	31N06W33		1	1		4		0		3		1		0		0		1		1		641
SAN JUAN 31-6 UNIT #221	13656	SJ 31-6	31N06W33		1	26		902		97		531		67		59		0		405		254		253
SAN JUAN 31-6 UNIT #222	13666	SJ 31-6	31N06W32		1	9		175		19		103		18		11		0		74		60		220
SAN JUAN 31-6 UNIT #223	13613	SJ 31-6	31N06W32		1	27		1,614		173		950		96		106		0		749		487		149
SAN JUAN 31-6 UNIT #224	13691	SJ 31-6	31N06W31		1	13		396		42		233		32		26		0		176		135		274
SAN JUAN 31-6 UNIT #225R	13697	SJ 31-6	31N06W31		1	25		1,168		125		687		76		76		0		535		350		263

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 19 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

											REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF		MMCF		M$		M$		TAXEX M$		M$		M$		M$		NUM
SAN JUAN 31-6 UNIT #228	14419	SJ 31-6	31N06W28		1	16		684		73		403		46		45		0		312		233		272
SAN JUAN 31-6 UNIT #229R	18279	SJ 31-6	31N06W28		1	15		469		50		276		37		31		0		208		153		640
SAN JUAN 31-6 UNIT #230	13555	SJ 31-6	31N06W27		1	27		1,546		166		910		93		101		0		716		463		125
SAN JUAN 31-6 UNIT #231R	17256	SJ 31-6	31N06W27		1	12		354		38		209		29		23		0		156		121		627
SAN JUAN 31-6 UNIT #232	13692	SJ 31-6	30N07W01		1	8		185		20		109		17		12		0		80		66		262
SAN JUAN 31-6 UNIT #233	13693	SJ 31-6	31N06W29		1	21		589		63		346		49		39		0		259		173		227
SAN JUAN 31-6 UNIT #234R	14007	SJ 31-6	31N06W29		1	7		97		10		57		12		6		0		38		33		337
SAN JUAN 32-7 UNIT #203R	12467	SJ 32-7	32N07W22		1	27		2,248		375		2,059		188		229		0		1,642		1,078		621
SAN JUAN 32-7 UNIT #204	13546	SJ 32-7	32N07W36		1	28		2,684		447		2,458		215		273		0		1,969		1,305		412
SAN JUAN 32-7 UNIT #206	12647	SJ 32-7	32N07W27		1	16		931		155		853		86		95		0		672		511		656
SAN JUAN 32-7 UNIT #207	13698	SJ 32-7	32N07W27		1	28		3,397		566		3,111		259		346		0		2,507		1,683		468
SAN JUAN 32-7 UNIT #208	13710	SJ 32-7	32N07W34		1	24		2,684		1,030		5,659		483		629		0		4,547		3,166		469
SAN JUAN 32-7 UNIT #209	13640	SJ 32-7	32N07W35		1	12		1,153		192		1,056		93		117		0		845		690		476
SAN JUAN 32-7 UNIT #210	13598	SJ 32-7	32N07W36		1	20		1,647		274		1,508		138		168		0		1,202		869		433
SAN JUAN 32-7 UNIT #211R	12642	SJ 32-7	32N07W35		1	20		1,214		202		1,112		111		124		0		878		631		618
SAN JUAN 32-7 UNIT #214	13717	SJ 32-7	32N07W34		1	10		214		82		451		75		50		0		326		260		551
SAN JUAN 32-7 UNIT #215	13700	SJ 32-7	32N07W32		1	21		1,562		260		1,431		134		159		0		1,138		815		481
SAN JUAN 32-7 UNIT #216	14422	SJ 32-7	31N07W04		1	7		109		18		100		21		11		0		68		57		581
SAN JUAN 32-7 UNIT #217	13701	SJ 32-7	31N07W04		1	13		342		57		314		45		35		0		234		179		570
SAN JUAN 32-7 UNIT #218	13702	SJ 32-7	31N07W05		1	25		1,422		237		1,302		134		145		0		1,023		675		571
SAN JUAN 32-7 UNIT #219	13703	SJ 32-7	31N07W05		1	22		1,655		276		1,516		141		169		0		1,206		852		572
SAN JUAN 32-7 UNIT #221	13704	SJ 32-7	31N07W08		1	22		1,281		213		1,173		119		130		0		924		641		552
SAN JUAN 32-7 UNIT #222 (APO)	14423	SJ 32-7	32N07W20		1	20		1,299		196		1,077		104		120		0		853		613		588
SAN JUAN 32-7 UNIT #228 FRT.PI	4816	SJ 32-7	31N07W07		1	16		1,643		140		769		66		85		0		617		481		617
SAN JUAN 32-7 UNIT #229	13729	SJ 32-7	31N07W09		1	22		1,290		215		1,181		121		131		0		929		637		566
SAN JUAN 32-7 UNIT #230	12620	SJ 32-7	31N07W17		1	23		1,724		287		1,579		148		176		0		1,255		868		616
SAN JUAN 32-7 UNIT #231	13664	SJ 32-7	31N07W17		1	18		415		69		380		60		42		0		278		191		567
SAN JUAN 32-7 UNIT #232	13705	SJ 32-7	31N07W08		1	15		529		88		485		62		54		0		370		274		556
SAN JUAN 32-7 UNIT #233	14452	SJ 32-7	32N07W20		1	25		2,194		366		2,009		180		223		0		1,606		1,103		592
SAN JUAN 32-7 UNIT #234	14425	SJ 32-7	32N07W32		1	20		1,765		294		1,616		145		180		0		1,292		941		583
SAN JUAN 32-7 UNIT #235	14426	SJ 32-7	32N07W29		1	20		2,632		439		2,410		197		268		0		1,945		1,450		589
SAN JUAN 32-7 UNIT #238	14455	SJ 32-7	32N07W29		1	27		3,457		576		3,166		260		352		0		2,554		1,742		593
SAN JUAN 32-7 UNIT #242	12643	SJ 32-7	32N07W33		1	20		2,187		364		2,003		171		223		0		1,609		1,181		657
SAN JUAN 32-7 UNIT #246A	12147	32-7	32N07W18		1	19		1,669		278		1,529		137		170		0		1,221		867		1354
SAN JUAN 32-7 UNIT COM #213 FRT.	4832	SJ 32-7	31N07W07		1	27		1,535		162		888		92		99		0		697		445		573
SAN JUAN 32-7 UNIT COM #220 FRT.	4835	SJ 32-7	31N07W05		1	25		2,174		317		1,741		156		194		0		1,392		954		619
SAN JUAN 32-7 UNIT COM #224 FRT.	4792	SJ 32-7	32N07W21		1	28		3,018		377		2,073		177		230		0		1,666		1,108		582
SAN JUAN 32-7 UNIT COM #227 FRT.	4843	SJ 32-7	31N07W18		1	21		1,176		154		844		83		94		0		667		468		574
SAN JUAN 32-8 UNIT #202	13657	SJ 32-8	32N08W27		1	28		3,775		431		2,368		193		263		0		1,912		1,289		432
SAN JUAN 32-8 UNIT #203	14507	SJ 32-8	32N08W33		1	22		2,127		243		1,334		117		148		0		1,069		762		584
SAN JUAN 32-8 UNIT #204	14508	SJ 32-8	32N08W34		1	23		2,478		283		1,554		132		173		0		1,249		889		585
SAN JUAN 32-8 UNIT #205	14511	SJ 32-8	32N08W34		1	23		2,524		288		1,584		134		176		0		1,273		906		590
SAN JUAN 32-8 UNIT #206	14445	SJ 32-8	31N08W24		1	13		478		55		300		37		33		0		230		179		548

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 20 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

											REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF		MMCF		M$		M$		TAXEX M$		M$		M$		M$		NUM
SAN JUAN 32-8 UNIT #207	13591	SJ 32-8	31N08W22		1	24		1,922		219		1,206		111		134		0		961		664		414
SAN JUAN 32-8 UNIT #208	13557	SJ 32-8	32N08W29		1	29		3,048		348		1,912		164		213		0		1,535		1,008		419
SAN JUAN 32-8 UNIT #213	12648	SJ 32-8	32N08W22		1	22		1,388		158		870		87		97		0		687		473		614
SAN JUAN 32-8 UNIT #218	14509	SJ 32-8	32N08W35		1	19		1,201		137		753		75		84		0		595		430		586
SAN JUAN 32-8 UNIT #219	14510	SJ 32-8	32N08W35		1	27		2,972		339		1,865		158		207		0		1,499		1,010		587
SAN JUAN 32-8 UNIT #220	13706	SJ 32-8	31N08W24		1	15		739		84		463		50		52		0		362		276		544
SAN JUAN 32-8 UNIT #221	13642	SJ 32-8	31N08W09		1	16		920		105		577		58		64		0		454		346		499
SAN JUAN 32-8 UNIT #222	13658	SJ 32-8	31N08W09		1	26		1,716		196		1,076		106		120		0		851		558		500
SAN JUAN 32-8 UNIT #223	13643	SJ 32-8	31N08W10		1	22		1,064		121		668		72		74		0		521		358		488
SAN JUAN 32-8 UNIT #224	13644	SJ 32-8	31N08W10		1	28		2,304		263		1,445		133		161		0		1,152		746		486
SAN JUAN 32-8 UNIT #225	14427	SJ 32-8	31N08W15		1	21		1,590		182		998		94		111		0		793		562		517
SAN JUAN 32-8 UNIT #226	13707	SJ 32-8	31N08W15		1	18		1,230		140		772		75		86		0		611		450		487
SAN JUAN 32-8 UNIT #227	14428	SJ 32-8	31N08W16		1	17		856		98		537		57		60		0		420		311		473
SAN JUAN 32-8 UNIT #228	14429	SJ 32-8	31N08W16		1	20		899		103		564		64		63		0		437		304		471
SAN JUAN 32-8 UNIT #229	13708	SJ 32-8	32N08W20		1	26		3,127		357		1,962		163		218		0		1,580		1,084		501
SAN JUAN 32-8 UNIT #230	13716	SJ 32-8	32N08W28		1	19		2,895		330		1,816		145		202		0		1,469		1,115		510
SAN JUAN 32-8 UNIT #231	13715	SJ 32-8	32N08W28		1	22		2,371		271		1,487		128		165		0		1,194		851		511
SAN JUAN 32-8 UNIT #232	13709	SJ 32-8	32N08W29		1	26		2,413		275		1,514		134		168		0		1,212		818		502
SAN JUAN 32-8 UNIT #233	13712	SJ 32-8	32N08W30		1	23		3,484		398		2,185		174		243		0		1,768		1,271		512
SAN JUAN 32-8 UNIT #234	14430	SJ 32-8	31N08W21		1	15		1,011		115		634		62		70		0		502		385		565
SAN JUAN 32-8 UNIT #235	14431	SJ 32-8	31N08W21		1	14		552		63		346		42		38		0		266		202		564
SAN JUAN 32-8 UNIT #236	14432	SJ 32-8	31N08W22		1	18		1,000		114		627		65		70		0		493		363		577
SAN JUAN 32-8 UNIT #237	13645	SJ 32-8	31N08W23		1	18		868		99		545		60		61		0		424		305		539
SAN JUAN 32-8 UNIT #238	13652	SJ 32-8	31N08W23		1	18		1,512		173		949		86		105		0		757		564		538
SAN JUAN 32-8 UNIT #239	13714	SJ 32-8	32N08W30		1	20		1,389		159		871		84		97		0		691		496		569
SAN JUAN 32-8 UNIT #240	13725	SJ 32-8	31N08W03		1	15		1,039		119		652		63		72		0		516		396		553
SAN JUAN 32-8 UNIT #241	13713	SJ 32-8	31N08W04		1	17		1,248		142		783		74		87		0		622		471		554
SAN JUAN 32-8 UNIT #242	14433	SJ 32-8	31N08W04		1	21		1,259		144		790		79		88		0		623		439		576
SAN JUAN 32-8 UNIT #243	14434	SJ 32-8	31N08W11		1	21		1,307		149		820		81		91		0		647		458		555
SAN JUAN 32-8 UNIT #244	13730	SJ 32-8	31N08W14		1	24		2,058		235		1,291		116		144		0		1,031		714		562
SAN JUAN 32-8 UNIT #245	14435	SJ 32-8	31N08W14		1	14		769		88		483		50		54		0		379		294		563
SAN JUAN 32-8 UNIT #247	12555	SJ 32-8	32N08W19		1	24		3,721		425		2,334		186		259		0		1,889		1,339		1195
SAN JUAN 32-8 UNIT #248	759	SJ 32-8	31N08W11		1	18		1,229		140		771		75		86		0		610		448		568
SAN JUAN 32-8 UNIT #249	14437	SJ 32-8	31N08W03		1	19		1,520		173		954		88		106		0		759		556		557
SAN JUAN 32-8 UNIT #250	13731	SJ 32-8	32N08W33		1	21		1,857		212		1,165		105		129		0		931		665		558
SAN JUAN 32-8 UNIT #253	12649	SJ 32-8	32N08W27		1	19		1,031		118		647		68		72		0		507		362		615
SAN JUAN 32-8 UNIT #254	14084	SJ 32-8	32N08W23		1	16		422		48		265		38		29		0		197		143		622
SAN JUAN 32-8 UNIT #255	1874	SJ 32-8	32N08W24		1	8		245		28		154		21		17		0		116		97		1196
SAN JUAN 32-8 UNIT #256	19424	SJ 32-8	32N08W25		1	7		618		70		387		35		43		0		310		275		628
SAN JUAN 32-8 UNIT #257	16981	SJ 32-8	32N08W19		1	22		1,984		226		1,245		111		138		0		996		711		1197
SAN JUAN 32-8 UNIT #259A	5043	SJ 32-8	32N08W22		1	16		962		110		604		61		67		0		475		357		724
SAN JUAN 32-8 UNIT #261	17021	SJ 32-8	32N08W17		1	14		477		54		299		38		33		0		228		174		1198
SAN JUAN 32-8 UNIT #267A	10123	SJ 32-8	32N08W23		1	20		1,965		224		1,233		108		137		0		988		695		1345

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 21 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

											REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS		NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF		MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 32-8 UNIT #36	15041	SJ 32-8	32N08W25		1	15		200		23		125		29		14		0		83		57		371
SAN JUAN 32-9 UNIT #104	14466	SJ 32-9	32N10W24		1	24		2,391		53		290		25		32		0		233		161		426
SAN JUAN 32-9 UNIT #105	14467	SJ 32-9	31N09W08		1	13		390		9		47		6		5		0		36		27		427
SAN JUAN 32-9 UNIT #201	14438	SJ 32-9	31N09W02		1	12		266		6		32		5		4		0		24		18		441
SAN JUAN 32-9 UNIT #202	14439	SJ 32-9	31N09W02		1	15		831		18		101		10		11		0		79		60		442
SAN JUAN 32-9 UNIT #209	14273	SJ 32-9	31N10W02		1	9		104		2		13		3		1		0		8		6		443
SAN JUAN 32-9 UNIT #210	14274	SJ 32-9	31N10W02		1	14		193		18		100		22		11		0		67		47		444
SAN JUAN 32-9 UNIT #215	14468	SJ 32-9	32N09W10		1	19		990		22		120		12		13		0		94		68		503
SAN JUAN 32-9 UNIT #217 (APO)	14275	SJ 32-9	32N09W16		1	20		1,263		24		132		13		15		0		105		75		482
SAN JUAN 32-9 UNIT #220	14000	SJ 32-9	31N10W11		1	30		3,571		79		433		36		48		0		350		229		594
SAN JUAN 32-9 UNIT #221	12458	SJ 32-9	31N10W11		1	6		38		1		5		2		1		0		2		2		595
SAN JUAN 32-9 UNIT #222	12556	SJ 32-9	31N10W12		1	2		11		0		1		1		0		0		1		1		596
SAN JUAN 32-9 UNIT #223	12459	SJ 32-9	31N10W12		1	9		132		3		16		3		2		0		11		9		597
SAN JUAN 32-9 UNIT #226	14469	SJ 32-9	32N09W32		1	15		873		19		106		11		12		0		84		65		445
SAN JUAN 32-9 UNIT #228	14440	SJ 32-9	32N09W36		1	27		3,573		79		434		35		48		0		350		237		446
SAN JUAN 32-9 UNIT #229	14267	SJ 32-9	32N10W36		1	20		1,705		38		207		18		23		0		165		120		447
SAN JUAN 32-9 UNIT #230	14470	SJ 32-9	32N10W36		1	19		436		10		53		8		6		0		39		26		448
SAN JUAN 32-9 UNIT #235	14450	SJ 32-9	32N09W36		1	15		945		21		115		11		13		0		91		70		449
SAN JUAN 32-9 UNIT #250	14268	SJ 32-9	31N09W04		1	20		1,937		43		235		20		26		0		189		139		531
SAN JUAN 32-9 UNIT #251	14269	SJ 32-9	31N09W04		1	26		3,004		66		364		30		41		0		294		201		478
SAN JUAN 32-9 UNIT #252	14471	SJ 32-9	31N09W05		1	19		1,446		32		175		16		19		0		140		102		479
SAN JUAN 32-9 UNIT #253	14472	SJ 32-9	31N09W05		1	15		1,036		23		126		12		14		0		100		77		504
SAN JUAN 32-9 UNIT #254	14473	SJ 32-9	31N09W06		1	15		879		19		107		11		12		0		84		65		483
SAN JUAN 32-9 UNIT #255	14474	SJ 32-9	31N09W06		1	18		1,256		28		152		14		17		0		121		89		489
SAN JUAN 32-9 UNIT #257	14475	SJ 32-9	31N09W08		1	22		767		17		93		12		10		0		71		47		545
SAN JUAN 32-9 UNIT #258	14476	SJ 32-9	31N09W09		1	25		1,652		36		200		19		22		0		159		105		506
SAN JUAN 32-9 UNIT #259	14477	SJ 32-9	31N09W09		1	22		1,037		23		126		14		14		0		98		66		490
SAN JUAN 32-9 UNIT #260	14270	SJ 32-9	31N09W10		1	15		926		20		112		11		12		0		89		68		484
SAN JUAN 32-9 UNIT #261	14271	SJ 32-9	31N09W10		1	5		83		2		10		2		1		0		7		6		491
SAN JUAN 32-9 UNIT #262	14478	SJ 32-9	31N09W15		1	23		685		15		83		11		9		0		63		41		492
SAN JUAN 32-9 UNIT #263	14479	SJ 32-9	31N09W15		1	21		660		15		80		11		9		0		61		40		485
SAN JUAN 32-9 UNIT #264	14480	SJ 32-9	31N09W17		1	24		737		16		89		12		10		0		68		43		514
SAN JUAN 32-9 UNIT #268	14482	SJ 32-9	31N10W01		1	17		808		18		98		11		11		0		77		57		535
SAN JUAN 32-9 UNIT #269	14483	SJ 32-9	31N10W01		1	15		530		12		64		8		7		0		49		37		518
SAN JUAN 32-9 UNIT #270	14484	SJ 32-9	32N09W18		1	24		2,358		52		286		25		32		0		230		159		519
SAN JUAN 32-9 UNIT #271	14485	SJ 32-9	32N09W18		1	31		5,647		125		685		52		76		0		557		373		520
SAN JUAN 32-9 UNIT #273	14486	SJ 32-9	32N09W19		1	10		858		19		104		9		12		0		83		70		521
SAN JUAN 32-9 UNIT #274	14272	SJ 32-9	32N09W28		1	18		1,354		30		164		15		18		0		131		98		575
SAN JUAN 32-9 UNIT #275	14487	SJ 32-9	32N09W29		1	22		1,485		33		180		17		20		0		143		100		536
SAN JUAN 32-9 UNIT #276	14344	SJ 32-9	32N09W27		1	19		1,416		31		172		16		19		0		137		101		579
SAN JUAN 32-9 UNIT #277	14488	SJ 32-9	32N09W30		1	17		1,321		29		160		15		18		0		128		97		516
SAN JUAN 32-9 UNIT #278	14489	SJ 32-9	32N09W31		1	21		1,556		34		189		17		21		0		150		107		515
SAN JUAN 32-9 UNIT #279	14490	SJ 32-9	32N09W31		1	20		1,639		36		199		18		22		0		159		115		528

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 22 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS	NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF	MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 32-9 UNIT #281	14491	SJ 32-9	32N09W32		1	29	1,953		43		237		23		26		0		188		120		470
SAN JUAN 32-9 UNIT #282	14345	SJ 32-9	32N09W33		1	23	1,719		38		209		19		23		0		166		116		522
SAN JUAN 32-9 UNIT #283	14346	SJ 32-9	32N09W33		1	26	2,723		60		330		28		37		0		266		179		480
SAN JUAN 32-9 UNIT #284	14492	SJ 32-9	32N10W13		1	18	2,269		50		275		22		31		0		222		168		523
SAN JUAN 32-9 UNIT #285	14493	SJ 32-9	32N10W13		1	17	2,176		48		264		21		29		0		213		165		537
SAN JUAN 32-9 UNIT #286	14494	SJ 32-9	32N10W14		1	19	2,048		45		248		21		28		0		200		149		493
SAN JUAN 32-9 UNIT #287	14495	SJ 32-9	32N10W14		1	20	2,386		53		290		24		32		0		234		173		533
SAN JUAN 32-9 UNIT #288	14496	SJ 32-9	32N10W23		1	15	1,799		40		218		18		24		0		176		139		534
SAN JUAN 32-9 UNIT #289	14497	SJ 32-9	32N10W23		1	28	3,615		80		439		35		49		0		354		239		524
SAN JUAN 32-9 UNIT #291	14498	SJ 32-9	32N10W24		1	19	1,574		35		191		17		21		0		153		113		505
SAN JUAN 32-9 UNIT #292	14499	SJ 32-9	32N10W25		1	25	2,688		59		326		27		36		0		263		181		525
SAN JUAN 32-9 UNIT #293	14500	SJ 32-9	32N10W25		1	16	1,292		29		157		14		17		0		125		96		494
SAN JUAN 32-9 UNIT #294	14501	SJ 32-9	32N10W26		1	21	1,614		36		196		18		22		0		156		112		529
SAN JUAN 32-9 UNIT #295	14502	SJ 32-9	32N10W26		1	20	1,449		32		176		16		20		0		140		102		526
SAN JUAN 32-9 UNIT #296	13928	SJ 32-9	32N10W35		1	11	492		11		60		7		7		0		46		37		560
SAN JUAN 32-9 UNIT #297	13929	SJ 32-9	32N10W35		1	4	69		2		8		2		1		0		6		5		527
SAN JUAN 32-9 UNIT #300	14503	SJ 32-9	32N10W11		1	27	4,129		91		501		39		56		0		406		278		507
SAN JUAN 32-9 UNIT #301	14504	SJ 32-9	32N10W12		1	30	3,871		85		470		38		52		0		379		249		508
SAN JUAN 32-9 UNIT #302 (APO)	15548	SJ 32-9	32N09W09		1	18	902		20		109		12		12		0		86		62		658
SAN JUAN 32-9 UNIT #303 FRT.PI	12172		31N10W14		1	32	820		11		17		0		0		0		17		9		1261
SEYMOUR #720	14357	NON-UNIT	31N09W23		1	20	1,319		96		530		53		59		0		418		300		540
STATE GAS COM AA #1	14441	NON-UNIT	30N08W36		1	23	1,202		24		130		13		14		0		102		69		542
YAGER N COM #5 FRT.PI	4873	NON-UNIT	31N07W03		1	16	644		13		74		9		8		0		57		42		450
TOTAL PROVED DEVELOPED: 320-Acre New Mexico					616		706,708		54,827		301,283		31,028		33,489		0		236,766		163,095
TOTAL PROVED DEVELOPED: NEW MEXICO					932		961,262		78,638		432,073		43,999		48,024		0		340,050		240,612
PROVED UNDEVELOPED RESERVES
BONDS COM #100S	5140	NON-UNIT	32N10W15		1	18	1,000		50		273		28		30		38		178		110		1006
FC FEE COM #2A	5319	NON-UNIT	32N11W30		1	22	1,000		18		99		14		11		23		50		19		1182
FC STATE COM #19A	10781	NON-UNIT	30N09W36		1	22	1,000		20		108		11		12		20		66		27		1346
FEDERAL G #4A COM.PI	5796	SJ 32-7	31N07W10		1	25	2,000		333		1,832		160		204		158		1,310		583		1129
FEDERAL G COM #5	6009	NON-UNIT	31N07W03		1	19	1,400		29		160		15		18		22		105		64		1128
FRT 18-30N-7W (160-ACRE)	6048	NEBU	30N07W18		1	18	800		6		34		3		4		7		21		11		1062
FRT 26-32N-10W	10780	NON-UNIT	32N11W26		1	22	1,200		67		367		36		41		53		238		106		1204
FRT 28-28N-6W (160-ACRE)	6102	28-6	28N06W28		1	15	500		28		155		19		17		46		74		38		1344
FRT 28-31N-6W	1806	31-6	31N06W28		1	22	1,400		150		824		77		92		115		541		240		1289
FRT 29-31N-6W	1805	31-6	31N06W29		1	22	1,400		150		824		77		92		115		541		240		1288
FRT 30-30N-7W (160-ACRE)	1779	30-6	30N07W30		1	20	800		119		653		72		73		123		385		177		1278
FRT 32-31N-6W	1803	31-6	31N06W32		1	22	1,400		150		824		77		92		115		541		240		1287
GRASSY CANYON UNIT #3A	5809	SJ 32-7	32N07W31		1	21	1,500		97		532		49		59		61		363		181		1130
HEIZER #100S	5114	NON-UNIT	32N10W15		1	18	1,000		0		3		0		0		0		2		1		1005

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 23 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS	NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF	MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
HUBBARD GAS COM A #1S	5323	NON-UNIT	32N11W30		1	22	1,000		35		191		27		21		45		97		37		1183
JACQUEZ #331S	5582	NON-UNIT	31N08W07		1	9	300		23		126		15		14		52		45		25		1136
NE BLANCO UNIT #400A	1809	NEBU	31N06W07		1	12	500		4		21		2		2		7		11		5		1290
NE BLANCO UNIT #401A	5317	NEBU	30N07W09		1	7	500		4		21		2		2		6		11		9		834
NE BLANCO UNIT #402A	5145	NEBU	30N07W05		1	7	500		4		21		2		2		5		13		10		1007
NE BLANCO UNIT #404A	6026	NEBU	31N07W34		1	8	500		4		21		2		2		7		11		7		1060
NE BLANCO UNIT #409A	5273	NEBU	30N07W10		1	9	500		4		21		2		2		6		11		7		835
NE BLANCO UNIT #411A	5200	NEBU	30N07W10		1	7	500		4		21		2		2		4		13		11		768
NE BLANCO UNIT #412A	5802	NEBU	31N07W29		1	7	500		4		21		2		2		6		11		9		1310
NE BLANCO UNIT #414A	6023	NEBU	31N07W30		1	8	500		4		21		2		2		7		11		7		1054
NE BLANCO UNIT #415A	5207	NEBU	30N07W02		1	11	500		4		21		2		2		4		13		8		769
NE BLANCO UNIT #416A	5282	NEBU	31N07W21		1	9	500		4		21		2		2		7		11		7		1063
NE BLANCO UNIT #417A	5274	NEBU	30N07W02		1	8	500		4		21		2		2		7		11		8		832
NE BLANCO UNIT #419A	6031	NEBU	30N07W03		1	9	500		4		21		2		2		7		11		7		824
NE BLANCO UNIT #420A	5279	NEBU	31N07W28		1	10	500		4		21		2		2		7		11		6		1065
NE BLANCO UNIT #421A	6033	NEBU	30N07W04		1	10	500		4		21		2		2		7		11		6		825
NE BLANCO UNIT #423A	6037	NEBU	30N07W08		1	10	500		4		21		2		2		7		11		6		827
NE BLANCO UNIT #424A	6034	NEBU	30N07W04		1	10	500		4		21		2		2		7		11		6		1035
NE BLANCO UNIT #425A	6038	NEBU	30N07W08		1	12	500		4		21		2		2		7		11		5		826
NE BLANCO UNIT #427A	5148	NEBU	30N07W16		1	10	500		4		21		2		2		5		13		8		770
NE BLANCO UNIT #429A	5150	NEBU	30N07W17		1	10	500		4		21		2		2		5		13		8		771
NE BLANCO UNIT #431A	6046	NEBU	30N07W17		1	11	500		4		21		2		2		7		11		6		829
NE BLANCO UNIT #432A	5160	NEBU	30N07W07		1	10	500		4		21		2		2		5		13		8		1014
NE BLANCO UNIT #439A	5169	NEBU	30N08W13		1	10	500		4		21		2		2		5		13		8		1016
NE BLANCO UNIT #444A	6016	NEBU	31N07W23		1	9	500		4		21		2		2		7		11		7		1046
NE BLANCO UNIT #446A	6024	NEBU	31N07W33		1	11	500		4		21		2		2		7		11		6		1058
NE BLANCO UNIT #450A	5801	NEBU	31N07W32		1	7	500		4		21		2		2		6		11		9		1056
NE BLANCO UNIT #451A	6035	NEBU	30N07W06		1	12	500		4		21		2		2		7		11		5		1037
NE BLANCO UNIT #452A	5797	NEBU	31N07W15		1	11	500		4		21		2		2		7		11		6		1041
NE BLANCO UNIT #453A	6036	NEBU	30N07W06		1	8	500		4		21		2		2		7		11		8		1036
NE BLANCO UNIT #454A	6025	NEBU	31N07W33		1	7	500		4		21		2		2		6		11		9		1057
NE BLANCO UNIT #455A	5190	NEBU	31N07W31		1	9	500		4		21		2		2		5		13		8		1021
NE BLANCO UNIT #456A	6015	NEBU	31N07W26		1	9	500		4		21		2		2		7		11		7		1049
NE BLANCO UNIT #457	6022	NEBU	31N07W30		1	8	500		4		21		2		2		7		11		8		1066
NE BLANCO UNIT #457A	6014	NEBU	31N07W31		1	10	500		4		21		2		2		7		11		6		1055
NE BLANCO UNIT #459A	5800	NEBU	31N07W19		1	10	500		4		21		2		2		7		11		6		1043
NE BLANCO UNIT #461A	5182	NEBU	30N07W07		1	11	500		4		21		2		2		5		13		7		1024
NE BLANCO UNIT #465A	5243	NEBU	30N08W01		1	11	500		4		21		2		2		4		13		7		1027
NE BLANCO UNIT #466A	6027	NEBU	31N07W34		1	8	500		4		21		2		2		6		11		8		1059
NE BLANCO UNIT #467A	5269	NEBU	30N08W12		1	9	500		4		21		2		2		7		11		7		1061
NE BLANCO UNIT #469A	6007	NEBU	30N08W13		1	10	500		4		21		2		2		7		11		6		1040
NE BLANCO UNIT #470A	6021	NEBU	31N07W27		1	10	500		4		21		2		2		7		11		6		1050
NE BLANCO UNIT #471A	5272	NEBU	31N08W25		1	11	500		4		21		2		2		6		11		6		1064

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 24 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS	NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF	MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
NE BLANCO UNIT #472A	5803	NEBU	31N07W29		1	8	500		4		21		2		2		7		11		8		1052
NE BLANCO UNIT #473A	5281	NEBU	31N08W36		1	11	500		4		21		2		2		7		11		6		1067
NE BLANCO UNIT #475A	1787	NEBU	30N07W19		1	9	500		4		21		2		2		7		11		7		837
NE BLANCO UNIT #476A	5799	NEBU	31N07W22		1	12	500		4		21		2		2		7		11		5		1044
NE BLANCO UNIT #477S	1777	NEBU	30N07W29		1	9	500		4		21		2		2		6		12		8		1276
NE BLANCO UNIT #479A	1785	NEBU	30N07W20		1	9	500		4		21		2		2		7		11		7		839
NE BLANCO UNIT #481A	5153	NEBU	31N07W36		1	11	500		4		21		2		2		5		13		7		773
NE BLANCO UNIT #485A	6032	NEBU	30N07W03		1	8	500		4		21		2		2		7		11		8		823
NE BLANCO UNIT #488A	6019	NEBU	31N07W24		1	8	500		4		21		2		2		7		11		8		1047
NE BLANCO UNIT #489A	5792	NEBU	31N07W12		1	9	500		4		21		2		2		7		11		7		1039
NE BLANCO UNIT #493A	6012	NEBU	31N07W25		1	12	500		4		21		2		2		7		11		5		830
NE BLANCO UNIT #494A	6020	NEBU	31N07W27		1	9	500		4		21		2		2		7		11		7		1051
NE BLANCO UNIT #505A	1784	NEBU	30N07W21		1	9	500		4		21		2		2		7		11		7		838
NORDHAUS #716S	5839	NON-UNIT	31N09W13		1	21	800		58		320		36		36		70		179		72		1131
SAN JUAN 28-6 UNIT #400	6101	28-6	28N06W09		1	15	500		28		155		19		17		46		74		38		1343
SAN JUAN 28-6 UNIT #414S	6100	28-6	28N06W08		1	14	500		28		155		19		17		46		74		38		1342
SAN JUAN 29-6 UNIT #206A	5409	SJ 29-6	29N06W04		1	20	900		109		598		63		67		127		341		162		904
SAN JUAN 29-6 UNIT #211A	6094	SJ 29-6	29N06W20		1	18	900		109		598		63		67		127		341		187		923
SAN JUAN 29-6 UNIT #219A	6079	SJ 29-6	29N06W10		1	20	900		109		598		63		67		127		341		155		910
SAN JUAN 29-6 UNIT #222A	6083	SJ 29-6	29N06W12		1	20	900		109		598		63		67		127		341		154		914
SAN JUAN 29-6 UNIT #223A	6084	SJ 29-6	29N06W12		1	20	900		109		598		63		67		127		341		167		913
SAN JUAN 29-6 UNIT #224A	6085	SJ 29-6	29N06W13		1	22	900		109		598		63		67		127		341		134		916
SAN JUAN 29-6 UNIT #226A	6088	SJ 29-6	29N06W14		1	22	900		109		598		63		67		127		341		134		917
SAN JUAN 29-6 UNIT #257A	5645	SJ 29-6	29N06W09		1	20	900		109		598		63		67		127		341		155		907
SAN JUAN 29-6 UNIT #258A	6089	SJ 29-6	29N06W16		1	22	900		109		598		63		67		127		341		134		920
SAN JUAN 29-6 UNIT #262A	6096	SJ 29-6	29N06W21		1	20	900		109		598		63		67		127		341		166		925
SAN JUAN 29-7 UNIT #519S	6063	29-7	29N07W08		1	18	700		71		388		43		43		80		223		112		1327
SAN JUAN 29-7 UNIT #520S	6062	SJ 29-7	29N07W08		1	17	700		71		388		43		43		80		223		126		888
SAN JUAN 29-7 UNIT #530S	6076	29-7	29N07W34		1	19	700		71		388		43		43		80		223		103		1334
SAN JUAN 29-7 UNIT #532S	1866	29-7	29N07W02		1	18	700		71		388		43		43		80		223		109		1292
SAN JUAN 29-7 UNIT #533S	1550	29-7	29N07W03		1	19	700		71		388		43		43		80		223		104		1270
SAN JUAN 29-7 UNIT #534S	6064	29-7	29N07W09		1	17	700		71		388		43		43		80		223		130		1328
SAN JUAN 29-7 UNIT #538S	6075	29-7	29N07W26		1	19	700		71		388		43		43		80		223		103		1333
SAN JUAN 29-7 UNIT #540S	6065	29-7	29N07W10		1	18	700		71		388		43		43		80		223		111		1329
SAN JUAN 29-7 UNIT #544S	6053	SJ 29-7	29N07W04		1	17	700		71		388		43		43		80		223		126		884
SAN JUAN 29-7 UNIT #546S	6054	29-7	29N07W04		1	18	700		71		388		43		43		80		223		113		1324
SAN JUAN 29-7 UNIT #547S	6061	29-7	29N07W07		1	18	700		71		388		43		43		80		223		110		1326
SAN JUAN 29-7 UNIT #548S	6055	29-7	29N07W07		1	17	700		71		388		43		43		80		223		130		1325
SAN JUAN 29-7 UNIT #551S	6066	29-7	29N07W11		1	17	700		230		1,263		137		140		295		691		364		1330
SAN JUAN 29-7 UNIT #552S	6067	SJ 29-7	29N07W12		1	17	700		71		388		43		43		80		223		124		893
SAN JUAN 29-7 UNIT #553S	1546	SJ 29-7	29N07W14		1	17	700		71		388		43		43		80		223		125		901
SAN JUAN 29-7 UNIT #560S	6072	29-7	29N07W23		1	17	700		290		1,593		175		177		376		866		454		1331
SAN JUAN 29-7 UNIT #562S	6071	SJ 29-7	29N07W24		1	17	700		71		388		43		43		80		223		123		896

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 25 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS	NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF	MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 29-7 UNIT #577S	12177	SJ 29-7	29N07W35		1	16	700		52		286		33		32		66		155		88		1206
SAN JUAN 29-7 UNIT #580S	6052	SJ 29-7	29N07W01		1	17	700		71		388		43		43		80		223		124		881
SAN JUAN 29-7 UNIT #582S	1864	29-7	29N07W02		1	18	700		71		388		43		43		80		223		113		1291
SAN JUAN 29-7 UNIT #585S	12212	29-7	29N07W15		1	18	700		71		388		43		43		80		223		110		1357
SAN JUAN 30-5 UNIT #204A	5685	30-5	30N05W07		1	10	500		85		468		43		52		179		194		110		1303
SAN JUAN 30-5 UNIT #205A	5678	30-5	30N05W07		1	7	500		85		468		43		52		179		194		139		1302
SAN JUAN 30-5 UNIT #211A	5783	SJ 30-5	30N05W31		1	9	500		85		468		43		52		179		194		122		986
SAN JUAN 30-5 UNIT #220A	8014	SJ 30-5	30N05W08		1	8	500		85		468		43		52		179		194		135		1203
SAN JUAN 30-5 UNIT #224A	5719	SJ 30-5	30N05W17		1	9	500		85		468		43		52		179		194		121		966
SAN JUAN 30-5 UNIT #227A	5744	SJ 30-5	30N05W28		1	9	500		85		468		43		52		179		194		114		981
SAN JUAN 30-5 UNIT #228A	5745	SJ 30-5	30N05W28		1	9	500		85		468		43		52		179		194		115		980
SAN JUAN 30-5 UNIT #232A	5786	30-5	30N05W33		1	10	500		85		468		43		52		179		194		103		1307
SAN JUAN 30-5 UNIT #233A	5787	SJ 30-5	30N05W33		1	9	500		85		468		43		52		179		194		114		988
SAN JUAN 30-5 UNIT #235A	5743	30-5	30N05W27		1	10	500		85		468		43		52		179		194		111		1306
SAN JUAN 30-5 UNIT #236A	5742	30-5	30N05W27		1	10	500		85		468		43		52		179		194		111		1305
SAN JUAN 30-5 UNIT #238A	5789	30-5	30N05W34		1	11	500		85		468		43		52		179		194		102		1309
SAN JUAN 30-5 UNIT #239A	5716	SJ 30-5	30N05W15		1	7	500		85		468		43		52		210		164		116		964
SAN JUAN 30-5 UNIT #241A	5739	30-5	30N05W23		1	7	500		85		468		43		52		179		194		138		1304
SAN JUAN 30-5 UNIT #242A	5788	30-5	30N05W34		1	10	500		85		468		43		52		179		194		112		1308
SAN JUAN 30-5 UNIT #246A	5741	SJ 30-5	30N05W26		1	9	500		85		468		43		52		179		194		122		978
SAN JUAN 30-5 UNIT #248A	11693	30-5	30N05W35		1	7	500		75		411		39		46		159		167		118		1347
SAN JUAN 30-5 UNIT #249A	5740	SJ 30-5	30N05W23		1	8	500		85		468		43		52		179		194		134		976
SAN JUAN 30-5 UNIT #255A	5714	SJ 30-5	30N05W14		1	7	500		85		468		43		52		184		189		142		962
SAN JUAN 30-5 UNIT #257A	5712	SJ 30-5	30N05W11		1	8	500		85		468		43		52		187		186		126		959
SAN JUAN 30-5 UNIT #258A	5715	SJ 30-5	30N05W14		1	7	500		85		468		43		52		186		187		140		961
SAN JUAN 30-5 UNIT #259A	12145	30-5	30N05W13		1	7	500		85		468		43		52		188		185		129		1353
SAN JUAN 30-5 UNIT #261A	5713	SJ 30-5	30N05W11		1	7	500		85		468		43		52		187		187		136		958
SAN JUAN 30-5 UNIT #262A	5791	SJ 30-5	30N05W12		1	9	500		85		468		43		52		179		194		115		960
SAN JUAN 30-5 UNIT #267A	11794	30-5	30N05W24		1	7	500		85		468		43		52		179		194		137		1348
SAN JUAN 30-5 UNIT #268A	11795	30-5	30N05W24		1	7	500		85		468		43		52		189		184		127		1349
SAN JUAN 30-6 UNIT #403S	5435	SJ 30-6	30N06W09		1	16	700		35		192		22		21		39		110		65		777
SAN JUAN 30-6 UNIT #406S	6043	SJ 30-6	30N07W15		1	16	700		35		192		22		21		35		115		71		861
SAN JUAN 30-6 UNIT #407S	5527	SJ 30-6	30N06W16		1	18	700		35		192		22		21		41		108		56		849
SAN JUAN 30-6 UNIT #409S	5521	SJ 30-6	30N07W25		1	17	700		35		192		22		21		29		120		74		780
SAN JUAN 30-6 UNIT #416S	5519	SJ 30-6	30N07W24		1	17	700		35		192		22		21		33		116		70		783
SAN JUAN 30-6 UNIT #417S	5429	SJ 30-6	30N07W25		1	17	700		35		192		22		21		29		120		74		762
SAN JUAN 30-6 UNIT #418S	5522	SJ 30-6	30N07W26		1	16	700		35		192		22		21		31		118		74		784
SAN JUAN 30-6 UNIT #421S	1622	30-6	30N07W34		1	19	700		35		192		22		21		41		108		50		1271
SAN JUAN 30-6 UNIT #423S	1782	30-6	30N07W28		1	18	700		35		192		22		21		41		108		53		1280
SAN JUAN 30-6 UNIT #428S	1783	30-6	30N07W28		1	19	700		35		192		22		21		41		108		50		1281
SAN JUAN 30-6 UNIT #429S	1773	30-6	30N07W32		1	16	700		35		192		22		21		33		116		73		1273
SAN JUAN 30-6 UNIT #439S	5524	SJ 30-6	30N06W14		1	18	700		35		192		22		21		41		108		56		846
SAN JUAN 30-6 UNIT #440S	5526	SJ 30-6	30N06W15		1	18	700		35		192		22		21		41		108		56		847

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 26 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.						BFIT NET		10% DISC
						LIFE	GROSS GAS	NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF	MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 30-6 UNIT #441S	5495	SJ 30-6	30N06W31		1	16	700		35		192		22		21		34		115		71		792
SAN JUAN 30-6 UNIT #447S	1776	30-6	30N07W31		1	18	700		35		192		22		21		41		108		55		1275
SAN JUAN 30-6 UNIT #453S	5528	SJ 30-6	30N06W17		1	18	700		35		192		22		21		41		108		55		851
SAN JUAN 30-6 UNIT #456S	5531	SJ 30-6	30N06W18		1	17	700		35		192		22		21		41		108		61		852
SAN JUAN 30-6 UNIT #458S	5532	SJ 30-6	30N06W19		1	18	700		35		192		22		21		41		108		55		854
SAN JUAN 30-6 UNIT #459S	5533	SJ 30-6	30N06W20		1	17	700		35		192		22		21		41		108		61		855
SAN JUAN 30-6 UNIT #464S	5506	SJ 30-6	30N07W14		1	16	700		35		192		22		21		29		120		76		801
SAN JUAN 30-6 UNIT #465S	5507	SJ 30-6	30N07W15		1	16	700		35		192		22		21		29		120		76		802
SAN JUAN 30-6 UNIT #466S	6051	SJ 30-6	30N07W22		1	16	700		35		192		22		21		33		116		71		859
SAN JUAN 30-6 UNIT #470S	5534	SJ 30-6	30N06W21		1	17	700		35		192		22		21		41		108		61		856
SAN JUAN 30-6 UNIT #472S	5536	SJ 30-6	30N06W22		1	18	700		35		192		22		21		41		108		55		857
SAN JUAN 30-6 UNIT #474S	5540	SJ 30-6	30N06W27		1	17	700		35		192		22		21		41		108		60		866
SAN JUAN 30-6 UNIT #480S	5543	SJ 30-6	30N06W30		1	17	700		35		192		22		21		41		108		60		862
SAN JUAN 30-6 UNIT #482S	5494	SJ 30-6	30N06W31		1	16	700		35		192		22		21		34		115		71		805
SAN JUAN 30-6 UNIT #487S	5537	SJ 30-6	30N06W23		1	17	700		35		192		22		21		41		108		61		860
SAN JUAN 30-6 UNIT #492S	5538	30-6	30N06W26		1	18	700		35		192		22		21		47		103		48		1296
SAN JUAN 30-6 UNIT #494S	5498	SJ 30-6	30N06W33		1	16	700		35		192		22		21		32		117		73		812
SAN JUAN 30-6 UNIT #499S	1780	30-6	30N07W30		1	19	700		35		192		22		21		41		108		50		1279
SAN JUAN 30-6 UNIT #500S	1775	30-6	30N07W31		1	18	700		104		571		66		64		123		319		158		1274
SAN JUAN 30-6 UNIT #501SR	5496	SJ 30-6	30N06W32		1	17	700		35		192		22		21		41		108		61		815
SAN JUAN 31 FED 3 #2A	5942	NON-UNIT	31N09W03		1	18	1,500		223		1,224		113		136		168		807		526		1169
SAN JUAN 31-6 UNIT #207A	5615	SJ 31-6	30N06W06		1	20	1,400		150		824		77		92		115		541		305		937
SAN JUAN 31-6 UNIT #208A	5614	SJ 31-6	30N06W06		1	20	1,400		150		824		77		92		115		541		295		938
SAN JUAN 31-6 UNIT #209A	6030	SJ 31-6	30N07W01		1	18	1,400		150		824		77		92		94		561		377		933
SAN JUAN 31-6 UNIT #216A	1788	31-6	31N06W35		1	19	1,400		150		824		77		92		115		541		330		1282
SAN JUAN 31-6 UNIT #218A	1790	31-6	31N06W34		1	19	1,400		150		824		77		92		115		541		330		1284
SAN JUAN 31-6 UNIT #219A	1789	31-6	31N06W34		1	19	1,400		150		824		77		92		115		541		330		1283
SAN JUAN 31-6 UNIT #220A	1791	31-6	31N06W33		1	22	1,400		150		824		77		92		115		541		242		1285
SAN JUAN 31-6 UNIT #221A	1801	31-6	31N06W33		1	22	1,400		150		824		77		92		115		541		240		1286
SAN JUAN 31-6 UNIT #224A	708	SJ 31-6	31N06W31		1	20	1,400		150		824		77		92		115		541		295		1164
SAN JUAN 31-6 UNIT #225A	5611	SJ 31-6	31N06W31		1	20	1,400		150		824		77		92		115		541		302		1163
SAN JUAN 31-6 UNIT #232A	6029	SJ 31-6	30N07W01		1	18	1,400		150		824		77		92		93		562		375		934
SAN JUAN 32-7 UNIT #220A	6011	SJ 32-7	31N07W06		1	20	1,700		248		1,362		122		151		156		933		570		1170
SAN JUAN 32-7 UNIT #233A	5819	SJ 32-7	32N07W20		1	20	1,700		283		1,557		139		173		178		1,066		662		1173
SAN JUAN 32-8 UNIT #206A	5603	SJ 32-8	31N08W24		1	21	2,000		228		1,255		109		139		115		891		572		1158
SAN JUAN 32-8 UNIT #259	6004	SJ 32-8	32N08W22		1	22	2,000		228		1,255		109		139		122		884		491		1153
SAN JUAN 32-8 UNIT #261A	6507	SJ 32-8	32N08W17		1	21	2,000		228		1,255		109		139		122		884		549		1202
SAN JUAN 32-8 UNIT #267	6005	32-8	32N08W23		1	21	2,000		228		1,255		109		139		122		884		532		1323
SAN JUAN 32-9 UNIT #104S	5911	SJ 32-9	32N10W24		1	7	500		11		61		6		7		18		30		23		1107
SAN JUAN 32-9 UNIT #105S	5956	SJ 32-9	31N09W08		1	8	500		11		61		6		7		18		30		22		1084
SAN JUAN 32-9 UNIT #209S	5862	32-9	31N10W02		1	9	500		11		61		6		7		18		30		20		1316
SAN JUAN 32-9 UNIT #210S	5865	32-9	31N10W02		1	9	500		10		55		5		6		16		28		18		1317
SAN JUAN 32-9 UNIT #215S	5992	SJ 32-9	32N09W10		1	7	500		11		61		6		7		18		30		23		1089

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 27 of 28

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2005

										REVENUE		OPER.								BFIT NET		10% DISC
						LIFE	GROSS GAS	NET GAS		TO INT.		EXPENSE		ADV&SEV		CAPITAL		REVENUE		REVENUE		SEQ
LEASE NAME	PROPID	UNIT	LOCATION	WELLS		YEARS	MMCF	MMCF		M$		M$		TAXES M$		M$		M$		M$		NUM
SAN JUAN 32-9 UNIT #220S	5897	SJ 32-9	31N10W11		1	7	500		11		61		6		7		18		30		23		1090
SAN JUAN 32-9 UNIT #221S	5890	SJ 32-9	31N10W11		1	7	500		11		61		6		7		18		30		23		1091
SAN JUAN 32-9 UNIT #222S	5910	32-9	31N10W12		1	9	500		11		61		6		7		18		30		20		1319
SAN JUAN 32-9 UNIT #223S	5902	32-9	31N10W12		1	9	500		11		61		6		7		18		30		20		1318
SAN JUAN 32-9 UNIT #229S	5933	SJ 32-9	32N10W36		1	7	500		11		61		6		7		18		30		23		1125
SAN JUAN 32-9 UNIT #230S	5934	32-9	32N10W36		1	7	500		11		61		6		7		18		31		24		1320
SAN JUAN 32-9 UNIT #251S	5947	32-9	31N09W04		1	8	500		11		61		6		7		21		27		18		1321
SAN JUAN 32-9 UNIT #252S	5949	SJ 32-9	31N09W05		1	7	500		11		61		6		7		21		27		21		1080
SAN JUAN 32-9 UNIT #255S	5955	SJ 32-9	31N09W06		1	7	500		11		61		6		7		18		30		23		1081
SAN JUAN 32-9 UNIT #258S	5958	SJ 32-9	31N09W09		1	7	500		11		61		6		7		18		30		23		1086
SAN JUAN 32-9 UNIT #259S	5959	SJ 32-9	31N09W09		1	7	500		11		61		6		7		21		27		21		1085
SAN JUAN 32-9 UNIT #260S	5960	SJ 32-9	31N09W10		1	7	500		11		61		6		7		18		30		23		1088
SAN JUAN 32-9 UNIT #262S	5834	SJ 32-9	31N09W15		1	7	500		11		61		6		7		18		30		23		1099
SAN JUAN 32-9 UNIT #263S	5831	32-9	???		1	7	500		11		61		6		7		18		30		23		1311
SAN JUAN 32-9 UNIT #264S	5835	32-9	???		1	7	500		11		61		6		7		18		30		23		1312
SAN JUAN 32-9 UNIT #266S	5836	32-9	???		1	7	500		11		61		6		7		18		30		23		1313
SAN JUAN 32-9 UNIT #268S	5859	32-9	31N10W01		1	9	500		11		61		6		7		18		31		20		1314
SAN JUAN 32-9 UNIT #269S	5860	32-9	31N10W01		1	9	500		11		61		6		7		18		30		20		1315
SAN JUAN 32-9 UNIT #272S	726	SJ 32-9	32N09W21		1	7	500		11		61		6		7		18		30		23		1262
SAN JUAN 32-9 UNIT #278S	5967	SJ 32-9	32N09W31		1	7	500		11		61		6		7		18		30		23		1117
SAN JUAN 32-9 UNIT #285S	5855	SJ 32-9	32N10W13		1	7	500		11		61		6		7		21		27		20		1096
SAN JUAN 32-9 UNIT #288S	5916	SJ 32-9	32N10W23		1	7	500		11		61		6		7		21		27		20		1106
SAN JUAN 32-9 UNIT #292S	5925	SJ 32-9	32N10W25		1	7	500		11		61		6		7		18		30		23		1109
SAN JUAN 32-9 UNIT #296S	5853	SJ 32-9	32N10W35		1	7	500		11		61		6		7		18		30		23		1123
SAN JUAN 32-9 UNIT #297S	5854	SJ 32-9	32N10W35		1	7	500		11		61		6		7		17		31		24		1122
SEYMOUR #720S	12603	NON-UNIT	31N09W23		1	17	800		58		321		36		36		53		197		125		1134
STATE GAS COM AA #1A	10782	NON-UNIT	30N08W36		1	23	1,100		22		119		11		13		18		77		33		1205
SUTER #4A	5348	NON-UNIT	32N11W15		1	19	1,000		17		96		14		11		9		62		39		1293
TOTAL PROVED UNDEVELOPED: 160-Acre New Mexico					214		152,498		11,703		64,321		6,348		7,150		13,790		37,034		20,701
FRT 18-30N-7W	6047	NEBU	30N07W18		1	21	800		6		34		3		4		7		21		9		1042
SAN JUAN 29-7 UNIT #585	12211	29-7	29N07W15		1	17	700		71		388		43		43		80		223		121		1356
SAN JUAN 30-5 UNIT #225A	5773	SJ 30-5	30N05W29		1	11	500		85		468		43		52		179		194		99		982
SAN JUAN 32-7 UNIT #227A	6010	SJ 32-7	31N07W18		1	19	1,700		213		1,170		105		130		189		746		471		1162
TOTAL PROVED UNDEVELOPED: 320-Acre New Mexico					4		3,700		375		2,061		194		229		454		1,183		699
TOTAL PROVED UNDEVELOPED: NEW MEXICO					218		156,198		12,078		66,382		6,541		7,379		14,244		38,217		21,401
TOTAL PROVED RESERVES: NEW MEXICO					1150		1,117,460		90,716		498,454		50,540		55,403		14,244		378,267		262,013
TOTAL PROVED RESERVES					1171		1,151,842		97,748		528,517		50,540		55,403		14,244		408,330		282,646

DATE: 12/31/2005 This page is a part of a Miller and Lents, Ltd. report dated 01/12/2006 and should not be used independently of the report. TABLE 4
Page 28 of 28