INVOICE

          Remit to:                               From:

          Sierra Consultants                      ________________________
          Joseph L. Cousins                       ________________________
          10118 Avenel Gardens Lane               ________________________
          Silver Spring, MD 20903-1735            ________________________
          (301) 439-2738                          ________________________

                                                  Contact Individual:

                                                  ________________________
                                                  ________________________


          Qty  Description                   Unit Price          Total
          ===  =======================       =============       =========

          ___  BIO-CAL Program               $ 20.00             _________
          ___  dLock/dUnLock for dBase       $ 20.00             _________
          ___  dLimited for dBase            $ 20.00             _________


                                             Total               _________



          Size of DISKS to ship   5 1/4 [ ]    3 1/2 [ ]    DD [ ]  HD [ ]


          **Note:  When I ship 5 1/4 inch disks at DD (360K) I write them
          in a 1.2mb disk drive.  The probability that you will get a disk
          that you cannot read is very slim.  I suggest that you
          immediately make a copy (360K) of the disk that I send you. 
          Don't attempt to write on the master.