<ARTICLE> 5 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-START> JAN-01-1997 <PERIOD-END> SEP-30-1997 <CASH> 2,615,037 <SECURITIES> 590,091 <RECEIVABLES> 1,042,789 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 4,247,917 <PP&E> 20,192,070 <DEPRECIATION> 18,284,464 <TOTAL-ASSETS> 6,155,523 <CURRENT-LIABILITIES> 368,252 <BONDS> 121,002 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 5,666,269 <TOTAL-LIABILITY-AND-EQUITY> 6,155,523 <SALES> 0 <TOTAL-REVENUES> 2,332,217 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 1,740,770 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 22,767 <INCOME-PRETAX> 568,680 <INCOME-TAX> 0 <INCOME-CONTINUING> 568,680 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 568,680 <EPS-PRIMARY> 0 <EPS-DILUTED> 0