<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE SHEETS AS OF MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30, 1997 (UNAUDITED) AND THE STATEMENTS OF OPERATIONS FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30, 1997, 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-31-1997 JUN-30-1997 SEP-30-1997 <CASH> 184,259 156,288 150,339 <SECURITIES> 0 0 0 <RECEIVABLES> 65,490 47,788 43,160 <ALLOWANCES> 0 0 0 <INVENTORY> 0 0 0 <CURRENT-ASSETS> 249,749 204,076 193,499 <PP&E> 1,288,513 1,161,294 1,034,198 <DEPRECIATION> 900,423 812,906 734,071 <TOTAL-ASSETS> 637,839 552,464 493,626 <CURRENT-LIABILITIES> 0 0 0 <BONDS> 0 0 0 <PREFERRED-MANDATORY> 0 0 0 <PREFERRED> 0 0 0 <COMMON> 0 0 0 <OTHER-SE> 637,839 552,464 493,626 <TOTAL-LIABILITY-AND-EQUITY> 637,839 552,464 493,626 <SALES> 0 0 0 <TOTAL-REVENUES> 44,196 70,320 105,370 <CGS> 0 0 0 <TOTAL-COSTS> 23,006 29,722 35,731 <OTHER-EXPENSES> 0 0 0 <LOSS-PROVISION> 0 0 0 <INTEREST-EXPENSE> 0 0 0 <INCOME-PRETAX> 42,212 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> 42,212 82,063 123,409 <EPS-PRIMARY> 0 0 0 <EPS-DILUTED> 0 0 0