<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> JUN-30-1997 <CASH> 476,043 <SECURITIES> 0 <RECEIVABLES> 50,288 <ALLOWANCES> 4,945 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 2,327,317 <DEPRECIATION> 2,272,778 <TOTAL-ASSETS> 623,255 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 607,512 <TOTAL-LIABILITY-AND-EQUITY> 623,255 <SALES> 0 <TOTAL-REVENUES> 388,434 <CGS> 0 <TOTAL-COSTS> 232,762 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 180,782 <INCOME-TAX> 0 <INCOME-CONTINUING> 180,782 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 180,782 <EPS-PRIMARY> 0 <EPS-DILUTED> 0