<ARTICLE> 5 <LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT MARCH 31, 1997, JUNE 30, 1996 AND SEPTEMBER 30, 1996 (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 PERIOD MARCH 31, 1997.
</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>                               JAN-01-1997             JUN-30-1997             JAN-01-1997
<CASH>                                       1,750,995               1,653,049               1,616,451
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                1,097,401               1,044,323               1,195,517
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                             2,848,396               2,697,372               2,811,968
<PP&E>                                      63,500,454              63,405,182              63,301,457
<DEPRECIATION>                              16,876,941              17,776,635              18,645,814
<TOTAL-ASSETS>                              49,557,236              48,364,211              47,480,280
<CURRENT-LIABILITIES>                          626,330                 551,330                 476,330
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                             0                       0                       0
<OTHER-SE>                                  48,930,906              47,812,881              47,003,950
<TOTAL-LIABILITY-AND-EQUITY>                49,557,236              48,364,211              48,480,280
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                             1,396,464               2,743,047               4,230,484
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                1,003,834               2,009,504               2,976,765
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0
<INCOME-PRETAX>                                      0                       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>                                   429,063                 790,446               1,353,048
<EPS-PRIMARY>                                        0                       0                       0
<EPS-DILUTED>                                        0                       0                       0