<ARTICLE> 5 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> SEP-30-1997 <CASH> 131,635 <SECURITIES> 0 <RECEIVABLES> 51,499 <ALLOWANCES> 2,941 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 1,942,372 <DEPRECIATION> 1,817,471 <TOTAL-ASSETS> 305,314 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 290,443 <TOTAL-LIABILITY-AND-EQUITY> 305,314 <SALES> 0 <TOTAL-REVENUES> 359,293 <CGS> 0 <TOTAL-COSTS> 287,910 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 71,383 <INCOME-TAX> 0 <INCOME-CONTINUING> 71,383 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 71,383 <EPS-PRIMARY> 0 <EPS-DILUTED> 0