<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE SHEETS AT MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30, 1997 (UNAUDITED) AND THE STATEMENT OF OPERATIONS FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30, 1997 (UNAUDITED) AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS INCLUDED AS PART OF ITS QUARTERLY REPORT ON FORM 10-Q FOR THE RESPECTIVE PERIODS THEN ENDED </LEGEND> <PERIOD-TYPE> 3-MOS 6-MOS 9-MOS <FISCAL-YEAR-END> DEC-31-1997 DEC-31-1997 DEC-31-1997 <PERIOD-START> JAN-01-1997 JAN-01-1997 JAN-01-1997 <PERIOD-END> MAR-30-1997 JUN-30-1997 SEP-30-1997 <CASH> 1,403,584 1,584,210 1,254,994 <SECURITIES> 0 0 0 <RECEIVABLES> 558,803 471,338 472,943 <ALLOWANCES> 0 0 0 <INVENTORY> 0 0 0 <CURRENT-ASSETS> 1,962,387 2,055,548 1,727,937 <PP&E> 13,023,641 11,336,424 10,411,132 <DEPRECIATION> 8,253,040 7,294,869 6,814,848 <TOTAL-ASSETS> 6,732,988 6,097,103 5,324,221 <CURRENT-LIABILITIES> 0 0 0 <BONDS> 0 0 0 <PREFERRED-MANDATORY> 0 0 0 <PREFERRED> 0 0 0 <COMMON> 0 0 0 <OTHER-SE> 6,732,988 6,097,103 5,324,221 <TOTAL-LIABILITY-AND-EQUITY> 6,732,988 6,097,103 5,324,221 <SALES> 0 0 0 <TOTAL-REVENUES> 333,453 662,644 1,015,665 <CGS> 0 0 0 <TOTAL-COSTS> 196,826 374,168 517,705 <OTHER-EXPENSES> 0 0 0 <LOSS-PROVISION> 0 0 0 <INTEREST-EXPENSE> 0 0 0 <INCOME-PRETAX> 279,061 0 0 <INCOME-TAX> 0 0 0 <INCOME-CONTINUING> 0 0 0 <DISCONTINUED> 0 0 0 <EXTRAORDINARY> 0 0 0 <CHANGES> 0 0 0 <NET-INCOME> 279,061 577,149 919,010 <EPS-PRIMARY> 0 0 0 <EPS-DILUTED> 0 0 0