SEARS MUNICIPAL TRUST INSURED LONG TERM SERIES 42, 497J, 1994-09-23

SEARS MUNICIPAL TRUST INSURED LONG TERM SERIES 42
497J, 1994-09-23

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                                             Rule 497(j)
                                             Reg. No. 33-49207
                                             Reg. No. 33-27179    
                              

Pursuant to Rule 497 (j) promulgated under the Securities Act of
1933, the Registrant, Dean Witter Select Municipal Trust, Insured
California Portfolio Series 64 and Insured National Portfolio
Series 42, hereby certifies as follows:

1)   the form of prospectus that would have been filed under
     paragraph (b) of Rule 497 does not differ from that
     contained in the most recent amendment to the registration
     statement, and

2)   the text of the said amendment to the registration statement
     has been filed electronically.


                    DEAN WITTER SELECT MUNICIPAL TRUST,
                    INSURED CALIFORNIA PORTFOLIO SERIES 64
                    INSURED NATIONAL PORTFOLIO SERIES 42
                              
                    By:  Dean Witter Reynolds Inc.
                         (Depositor)


                         Michael D. Browne
                         Michael D. Browne
                         Authorized Signatory