EXHIBIT 99.13 FORM OF PURCHASE AGREEMENT

 
                                                                   EXHIBIT 99.13



                           FORM OF PURCHASE AGREEMENT

 
                               PURCHASE AGREEMENT


  Montana Tax-Free Fund, Inc. (the "Fund"), a corporation organized under the
laws of the State of North Dakota which proposes to register under the
Investment Company Act of 1940, and ND Capital, Inc. ("Capital"), a corporation
organized under the laws of the State of North Dakota which proposes to act as
the Fund's principal underwriter, hereby agree as follows:

  1.  The Fund offers Capital and Capital hereby purchases 10,000 shares of the
Fund, par value $.001 (the "Shares"), for $10 per Share for the aggregate
purchase price of $100,000.

  2.  Capital represents and warrants to the Fund that the Shares are being
acquired for investment purposes without any present intention of redeeming or
reselling them.

  IN WITNESS WHEREOF, the parties hereto have executed this Agreement this 17th
day of May, 1993.

                                ND CAPITAL, INC.



                                         By /Xxxxxx X. Xxxxxxx/

                                         Xxxxxx X. Xxxxxxx

                                         President
  
ATTEST:

       /Xxxxx X. Xxxxx/
       Xxxxx X. Xxxxx

       Secretary

                         MONTANA TAX-FREE FUND, INC.


                                             By /Xxxxxx X. Xxxxxxx/
                                             Xxxxxx X. Xxxxxxx
                                             President
ATTEST:

       /Xxxxx X. Xxxxx/
       Xxxxx X. Xxxxx
       Secretary