SCHEDULE 13G

EXHIBIT B

JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

The undersigned persons hereby agree that reports on Schedule 13G, and amendments thereto, with respect to the Common Stock of Wells Fargo & Company may be filed in a single statement on behalf of each of such persons, and further, each of such persons designates Warren E. Buffett as its agent and Attorney-in-Fact for the purpose of executing any and all Schedule 13G filings required to be made by it with the Securities and Exchange Commission.

Dated: February 14, 2007	/S/ Warren E. Buffett
	Warren E. Buffett
	Berkshire Hathaway Inc.
Dated: February 14, 2007	/S/ Warren E. Buffett
	By: Warren E. Buffett
	Title: Chairman of the Board
	OBH, Inc.
Dated: February 14, 2007	/S/ Warren E. Buffett
	By: Warren E. Buffett
	Title: Chairman of the Board
	National Indemnity Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	National Fire & Marine Insurance Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	Nebraska Furniture Mart, Inc.
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary

	The Fechheimer Brothers Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	Columbia Insurance Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	Blue Chip Stamps
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	Wesco Holdings Midwest, Inc.
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	Wesco Financial Corporation
Dated: February 14, 2007	/S/ Jeffrey L. Jacobson
	By: Jeffrey L. Jacobson
	Title: Vice President
	Wesco-Financial Insurance Co.
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	Precision Steel Warehouse, Inc.
Dated: February 14, 2007	/S/ Raymond Luchetti
	By: Raymond Luchetti
	Title: Treasurer

	National Liability & Fire Insurance Company
Dated: February 14, 2007	/S/ Forrest N. Krutter
	By: Forrest N. Krutter
	Title: Secretary
	Cypress Insurance Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	National Indemnity Company of the South
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	Redwood Fire and Casualty Insurance Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	GEICO Corporation
Dated: February 14, 2007	/S/ Michael H. Campbell
	By: Michael H. Campbell
	Title: Vice President
	Government Employees Insurance Company
Dated: February 14, 2007	/S/ Michael H. Campbell
	By: Michael H. Campbell
	Title: Vice President

	General Re Corporation
Dated: February 14, 2007	/S/ William Gasdaska
	By: William Gasdaska
	Title: Vice President
	General Reinsurance Corporation
Dated: February 14, 2007	/S/ William Gasdaska
	By: William Gasdaska
	Title: Vice President
	U.S. Investment Corporation
Dated: February 14, 2007	/S/ Louis S. Rivituso
	By: Louis S. Rivituso
	Title: Treasurer
	Mount Vernon Fire Insurance Company
Dated: February 14, 2007	/S/ Louis S. Rivituso
	By: Louis S. Rivituso
	Title: Treasurer
	U.S. Underwriters Insurance Company
Dated: February 14, 2007	/S/ Louis S. Rivituso
	By: Louis S. Rivituso
	Title: Treasurer
	United States Liability Insurance Company
Dated: February 14, 2007	/S/ Louis S. Rivituso
	By: Louis S. Rivituso
	Title: Treasurer
	The Medical Protective Company
Dated: February 14, 2007	/S/ Joseph Svitek
	By: Joseph Svitek
	Title: Senior Vice President
	Medical Protective Corporation
Dated: February 14, 2007	/S/ Joseph Svitek
	By: Joseph Svitek
	Title: Senior Vice President

	The Kansas Bankers Surety Company
Dated: February 14, 2007	/S/ Charles M. Towle
	By: Charles M. Towle
	Title: Senior Vice President
	Central States of Omaha Companies, Inc.
Dated: February 14, 2007	/S/ Gene H. Schellpeper
	By: Gene H. Schellpeper
	Title: Vice President
	Central States Indemnity Co. of Omaha
Dated: February 14, 2007	/S/ Gene H. Schellpeper
	By: Gene H. Schellpeper
	Title: Vice President