Exhibit (a)(17)

                           OFFER TO PURCHASE FOR CASH
                     All Outstanding Shares of Common Stock
                                       of
               PUTNAM CALIFORNIA INVESTMENT GRADE MUNICIPAL TRUST
                                       at
                              $14.16 Net Per Share
                                       by
                            MILDRED B. HOREJSI TRUST

  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
           TIME, ON FEBRUARY 16, 2007, UNLESS THE OFFER IS EXTENDED.

                                                                February 8, 2007

To Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees:

We have been appointed by the Mildred B. Horejsi Trust,  an irrevocable  grantor
trust  administered  in  accordance  with  Alaska  administrative  statutes  and
governed  by  Alaska  trust law (the  "Trust")  to act as  information  agent in
connection  with the Trust's  offer to  purchase  up to 100% of the  outstanding
shares of common  stock,  par value $0.001 per share (the  "shares"),  of Putnam
California  Investment  Grade Municipal  Trust, a  Massachusetts  business trust
("PCA"),  at $14.16 per share,  net to the seller in cash (subject to applicable
withholding of United States federal,  state and local taxes),  on the terms and
subject to the  conditions  set forth in the Offer to Purchase dated January 22,
2007 as amended by a Supplement dated February 8, 2007 (collectively, the "Offer
to Purchase") and the related letter of  transmittal  (which,  together with any
supplements or amendments thereto,  collectively constitute the "Offer"). Please
furnish  copies of the enclosed  materials to those of your clients for whom you
hold shares registered in your name or in the name of your nominee.

Enclosed herewith are copies of the following documents:

1.   Supplement to the Offer to Purchase dated February 8, 2007;
2.   Letter of  transmittal  for your use in accepting  the Offer and  tendering
     shares and for the information of your clients;
3.   A form of letter  that may be sent to your  clients  for whose  account you
     hold shares in your name or in the name of a nominee,  with space  provided
     for obtaining such client's instructions with regard to the Offer;
4.   Notice of guaranteed delivery with respect to shares;
5.   Guidelines  for   Certification  of  Taxpayer   Identification   Number  on
     Substitute  Form W-9;  and
6.   Return envelope addressed to The Colbent Corporation as the depositary.

CERTAIN  CONDITIONS  TO THE OFFER ARE  DESCRIBED  IN  SECTION 14 OF THE OFFER TO
PURCHASE AND THE  SUPPLEMENT  DATED  FEBRUARY 8, 2007.  ONE OF THESE  CONDITIONS
REQUIRES  THAT SHARES  ACCEPTED FOR PURCHASE  THAT ARE TENDERED BY  SHAREHOLDERS
HOLDING  SHARES  AS  OF  FEBRUARY  15,  2007  MUST  BE  ACCOMPANIED  BY A  VALID
IRREVOCABLE LEGAL PROXY TO VOTES SUCH SHARES.

WE URGE YOU TO CONTACT YOUR  CLIENTS AS PROMPTLY AS  POSSIBLE.  PLEASE NOTE THAT
THE OFFER AND  WITHDRAWAL  RIGHTS WILL EXPIRE AT 12:00  MIDNIGHT,  NEW YORK CITY
TIME, ON FEBRUARY 16, 2007, UNLESS THE OFFER IS EXTENDED.

In all cases, payment for shares accepted for payment pursuant to the Offer will
be made only after timely receipt by the depositary of (1) the  certificates for
(or a timely book-entry  confirmation (as defined in the Offer to Purchase) with
respect to) such shares,  (2) a letter of transmittal (or a facsimile  thereof),
properly completed and duly executed,  with any required  signature  guarantees,
or, in the case of a book-entry transfer effected pursuant to the procedures set
forth in Section 3 of the Offer to Purchase,  an agent's  message (as defined in
the Offer to Purchase),  and (3) any other  documents  required by the letter of
transmittal.  Accordingly, tendering stockholders may be paid at different times
depending  on when  certificates  for shares or  book-entry  confirmations  with
respect  to  shares  are  actually   received  by  the   depositary.   UNDER  NO
CIRCUMSTANCES  WILL  INTEREST  BE  PAID  ON THE  PURCHASE  PRICE  OF THE  SHARES
REGARDLESS  OF ANY EXTENSION OF OR AMENDMENT TO THE OFFER OR ANY DELAY IN PAYING
FOR SUCH SHARES.

The  Purchasers  will not pay any fees or commissions to any broker or dealer or
other person (other than the information agent and the depositary,  as described
in the Offer to  Purchase) in  connection  with the  solicitation  of tenders of
shares  pursuant  to the  Offer.  However,  the  Purchasers  will,  on  request,
reimburse you for  customary  mailing and handling  expenses  incurred by you in
forwarding copies of the enclosed Offer materials to your clients.

Questions  and requests for  additional  copies of the enclosed  material may be
directed to the information  agent at its address and telephone number set forth
on the back cover of the Offer to Purchase.

                                         Very truly yours,
                                         Morrow & Co.

     Nothing  contained herein or in the enclosed  documents shall render you or
any other person the agent of the Purchasers,  the  depositary,  the information
agent or any  affiliate of any of them or  authorize  you or any other person to
give any  information or use any document or make any statement on behalf of any
of them with  respect to the Offer  other than the  enclosed  documents  and the
statements contained therein.