<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> JUN-30-1997 <CASH> 293,238 <SECURITIES> 0 <RECEIVABLES> 139,192 <ALLOWANCES> 5,102 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 2,251,186 <DEPRECIATION> 2,237,991 <TOTAL-ASSETS> 441,567 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 390,674 <TOTAL-LIABILITY-AND-EQUITY> 441,567 <SALES> 0 <TOTAL-REVENUES> 416,342 <CGS> 0 <TOTAL-COSTS> 189,029 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 227,313 <INCOME-TAX> 0 <INCOME-CONTINUING> 227,313 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 227,313 <EPS-PRIMARY> 0 <EPS-DILUTED> 0