JOINT FILING AGREEMENT

   1
                                  EXHIBIT 7.1


                             JOINT FILING AGREEMENT


         We, the signatories of the statement on Schedule 13D to which this
Agreement is attached, hereby agree that such statement is, and any amendments
thereto filed by any of us will be, filed on behalf of each of us.

Dated:  April 3, 1997



                                       THE HEARST CORPORATION


                                       By:   /s/   Xxxxx X. Xxxx
                                             ----------------------------------
                                             Name:  Xxxxx X. Xxxx
                                             Title: Vice President 


                                       THE HEARST FAMILY TRUST


                                       By:   /s/     Xxxxxx X. Xxxxx
                                             ----------------------------------
                                             Name:   Xxxxxx X. Xxxxx
                                             Title:  Trustee