WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT DECEMBER 31, 1998 AND THE STATEMENT OF OPERATIONS FOR THE TWELVE MONTHS
ENDED DECEMBER 31, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS INCLUDED AS PART OF ITS ANNUAL REPORT ON FORM 10-K FOR THE
PERIOD DECEMBER 31, 1998.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                         278,140
<SECURITIES>                                         0
<RECEIVABLES>                                  134,960
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               413,100
<PP&E>                                       3,707,535
<DEPRECIATION>                               2,319,154
<TOTAL-ASSETS>                               1,801,481
<CURRENT-LIABILITIES>                                0
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                   1,801,481
<TOTAL-LIABILITY-AND-EQUITY>                 1,801,481
<SALES>                                              0
<TOTAL-REVENUES>                               473,605
<CGS>                                                0
<TOTAL-COSTS>                                  265,024
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   361,162
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                        0
        
[ARTICLE] 5
[LEGEND]
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT SEPTEMBER 30, 1998 (UNAUDITED) AND THE STATEMENT OF OPERATIONS FOR THE
QUARTERLY PERIOD ENDED SEPTEMBER 30, 1998 (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 SEPTEMBER 30, 1998.
[/LEGEND]
       
<S>                             <C>
[PERIOD-TYPE]                   9-MOS
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               SEP-30-1998
[CASH]                                         278,933
[SECURITIES]                                         0
[RECEIVABLES]                                   89,599
[ALLOWANCES]                                         0
[INVENTORY]                                          0
[CURRENT-ASSETS]                               368,532
[PP&E]                                       3,908,934
[DEPRECIATION]                               2,395,749
[TOTAL-ASSETS]                               1,881,717
[CURRENT-LIABILITIES]                                0
[BONDS]                                              0
[PREFERRED-MANDATORY]                                0
[PREFERRED]                                          0
[COMMON]                                             0
[OTHER-SE]                                   1,881,717
[TOTAL-LIABILITY-AND-EQUITY]                 1,881,717
[SALES]                                              0
[TOTAL-REVENUES]                               357,771
[CGS]                                                0
[TOTAL-COSTS]                                  197,217
[OTHER-EXPENSES]                                     0
[LOSS-PROVISION]                                     0
[INTEREST-EXPENSE]                                   0
[INCOME-PRETAX]                                      0
[INCOME-TAX]                                         0
[INCOME-CONTINUING]                                  0
[DISCONTINUED]                                       0
[EXTRAORDINARY]                                      0
[CHANGES]                                            0
[NET-INCOME]                                   260,288
[EPS-PRIMARY]                                        0
[EPS-DILUTED]                                        0
        
[ARTICLE] 5
[LEGEND]
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT JUNE 30, 1998 (UNAUDITED) AND THE STATEMENT OF OPERATIONS FOR THE
QUARTERLY PERIOD ENDED JUNE 30, 1998 (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 JUNE 30, 1998.
[/LEGEND]
       
<S>                             <C>
[PERIOD-TYPE]                   6-MOS
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               JUN-30-1998
[CASH]                                         310,280
[SECURITIES]                                         0
[RECEIVABLES]                                   87,034
[ALLOWANCES]                                         0
[INVENTORY]                                          0
[CURRENT-ASSETS]                               397,314
[PP&E]                                       4,035,211
[DEPRECIATION]                               2,418,701
[TOTAL-ASSETS]                               2,013,824
[CURRENT-LIABILITIES]                                0
[BONDS]                                              0
[PREFERRED-MANDATORY]                                0
[PREFERRED]                                          0
[COMMON]                                             0
[OTHER-SE]                                   2,013,824
[TOTAL-LIABILITY-AND-EQUITY]                 2,013,824
[SALES]                                              0
[TOTAL-REVENUES]                               252,626
[CGS]                                                0
[TOTAL-COSTS]                                  131,791
[OTHER-EXPENSES]                                     0
[LOSS-PROVISION]                                     0
[INTEREST-EXPENSE]                                   0
[INCOME-PRETAX]                                      0
[INCOME-TAX]                                         0
[INCOME-CONTINUING]                                  0
[DISCONTINUED]                                       0
[EXTRAORDINARY]                                      0
[CHANGES]                                            0
[NET-INCOME]                                   182,177
[EPS-PRIMARY]                                        0
[EPS-DILUTED]                                        0
        
[ARTICLE] 5
[LEGEND]
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT MARCH 31, 1998 (UNAUDITED) AND THE STATEMENT OF OPERATIONS FOR THE
QUARTERLY PERIOD ENDED MARCH 31, 1998 (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, 1998.
[/LEGEND]
       
<S>                             <C>
[PERIOD-TYPE]                   3-MOS
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               MAR-31-1998
[CASH]                                         291,509
[SECURITIES]                                         0
[RECEIVABLES]                                   97,703
[ALLOWANCES]                                         0
[INVENTORY]                                          0
[CURRENT-ASSETS]                               389,212
[PP&E]                                       4,170,201
[DEPRECIATION]                               2,441,880
[TOTAL-ASSETS]                               2,117,533
[CURRENT-LIABILITIES]                                0
[BONDS]                                              0
[PREFERRED-MANDATORY]                                0
[PREFERRED]                                          0
[COMMON]                                             0
[OTHER-SE]                                   2,117,533
[TOTAL-LIABILITY-AND-EQUITY]                 2,117,533
[SALES]                                              0
[TOTAL-REVENUES]                               132,892
[CGS]                                                0
[TOTAL-COSTS]                                   68,325
[OTHER-EXPENSES]                                     0
[LOSS-PROVISION]                                     0
[INTEREST-EXPENSE]                                   0
[INCOME-PRETAX]                                      0
[INCOME-TAX]                                         0
[INCOME-CONTINUING]                                  0
[DISCONTINUED]                                       0
[EXTRAORDINARY]                                      0
[CHANGES]                                            0
[NET-INCOME]                                    88,605
[EPS-PRIMARY]                                        0
[EPS-DILUTED]                                        0
        
[ARTICLE] 5
[LEGEND]
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT DECEMBER 31, 1997 AND THE STATEMENT OF OPERATIONS FOR THE TWELVE MONTHS
ENDED DECEMBER 31, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS INCLUDED AS PART OF ITS ANNUAL REPORT ON FORM 10-K FOR THE
PERIOD DECEMBER 31, 1997
[/LEGEND]
       
<S>                             <C>
[PERIOD-TYPE]                   12-MOS
[FISCAL-YEAR-END]                          DEC-31-1997
[PERIOD-START]                             JAN-01-1997
[PERIOD-END]                               DEC-31-1997
[CASH]                                         347,836
[SECURITIES]                                         0
[RECEIVABLES]                                   56,777
[ALLOWANCES]                                         0
[INVENTORY]                                          0
[CURRENT-ASSETS]                               404,613
[PP&E]                                       4,256,153
[DEPRECIATION]                               2,434,556
[TOTAL-ASSETS]                               2,226,210
[CURRENT-LIABILITIES]                                0
[BONDS]                                              0
[PREFERRED-MANDATORY]                                0
[PREFERRED]                                          0
[COMMON]                                             0
[OTHER-SE]                                   2,226,210
[TOTAL-LIABILITY-AND-EQUITY]                 2,226,210
[SALES]                                              0
[TOTAL-REVENUES]                               476,181
[CGS]                                                0
[TOTAL-COSTS]                                  284,930
[OTHER-EXPENSES]                                     0
[LOSS-PROVISION]                                     0
[INTEREST-EXPENSE]                                   0
[INCOME-PRETAX]                                      0
[INCOME-TAX]                                         0
[INCOME-CONTINUING]                                  0
[DISCONTINUED]                                       0
[EXTRAORDINARY]                                      0
[CHANGES]                                            0
[NET-INCOME]                                   273,177
[EPS-PRIMARY]                                        0
[EPS-DILUTED]                                        0
        
[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 PERIOD MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30,
1997 ON FORM 10-Q FOR THE RESPECTIVE PERIODS THEN ENDED
[/LEGEND]
       
<S>                             <C>                     <C>                     <C>
[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]                                         296,318                 309,254                 330,966
[SECURITIES]                                         0                       0                       0
[RECEIVABLES]                                  110,688                 115,388                 106,561
[ALLOWANCES]                                         0                       0                       0
[INVENTORY]                                          0                       0                       0
[CURRENT-ASSETS]                               407,006                 424,642                 437,527
[PP&E]                                       4,620,803               4,491,820               4,361,934
[DEPRECIATION]                               2,455,486               2,447,461               2,435,439
[TOTAL-ASSETS]                               2,572,323               2,469,001               2,364,022
[CURRENT-LIABILITIES]                                0                       0                       0
[BONDS]                                              0                       0                       0
[PREFERRED-MANDATORY]                                0                       0                       0
[PREFERRED]                                          0                       0                       0
[COMMON]                                             0                       0                       0
[OTHER-SE]                                   2,572,323               2,469,001               2,364,022
[TOTAL-LIABILITY-AND-EQUITY]                 2,572,323               2,469,001               2,364,022
[SALES]                                              0                       0                       0
[TOTAL-REVENUES]                               121,330                 234,230                 355,780
[CGS]                                                0                       0                       0
[TOTAL-COSTS]                                   71,299                 142,697                 211,619
[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]                                    63,025                 127,876                 207,241
[EPS-PRIMARY]                                        0                       0                       0
[EPS-DILUTED]                                        0                       0                       0
        
[ARTICLE] 5
[LEGEND]
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT DECEMBER 31, 1996 AND THE STATEMENT OF OPERATIONS FOR THE TWELVE MONTHS
ENDED DECEMBER 31, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS INCLUDED AS PART OF ITS ANNUAL REPORT ON FORM 10-K FOR THE
PERIOD DECEMBER 31, 1996
[/LEGEND]
       
<S>                             <C>
[PERIOD-TYPE]                   12-MOS
[FISCAL-YEAR-END]                          DEC-31-1996
[PERIOD-START]                             JAN-01-1996
[PERIOD-END]                               DEC-31-1996
[CASH]                                         331,167
[SECURITIES]                                         0
[RECEIVABLES]                                  126,589
[ALLOWANCES]                                         0
[INVENTORY]                                          0
[CURRENT-ASSETS]                               457,756
[PP&E]                                       4,666,319
[DEPRECIATION]                               2,414,262
[TOTAL-ASSETS]                               2,709,813
[CURRENT-LIABILITIES]                                0
[BONDS]                                              0
[PREFERRED-MANDATORY]                                0
[PREFERRED]                                          0
[COMMON]                                             0
[OTHER-SE]                                   2,709,813
[TOTAL-LIABILITY-AND-EQUITY]                 2,709,813
[SALES]                                              0
[TOTAL-REVENUES]                               619,504
[CGS]                                                0
[TOTAL-COSTS]                                  290,301
[OTHER-EXPENSES]                                     0
[LOSS-PROVISION]                                     0
[INTEREST-EXPENSE]                                   0
[INCOME-PRETAX]                                      0
[INCOME-TAX]                                         0
[INCOME-CONTINUING]                                  0
[DISCONTINUED]                                       0
[EXTRAORDINARY]                                      0
[CHANGES]                                            0
[NET-INCOME]                                   408,537
[EPS-PRIMARY]                                        0
[EPS-DILUTED]                                        0
        
[ARTICLE] 5
[LEGEND]
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEETS AT MARCH 31, 1996 (UNAUDITED), JUNE 30, 1996 (UNAUDITED) AND SEPTEMBER
30, 1996 (UNAUDITED) AND THE STATEMENTS OF OPERATIONS FOR THE QUARTERLY PERIODS
ENDED MARCH 31, 1996 (UNAUDITED), JUNE 30, 1996 (UNAUDITED) AND SEPTEMBER 30,
1996 (UNAUDITED) AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS INCLUDED AS PART OF ITS QUARTERLY REPORT ON FORM 10-K FOR THE PERIODS
ENDED MARCH 31, 1996, JUNE 30, 1996 AND SEPTEMBER 30, 1996. ON FORM 10-Q FOR THE
RESPECTIVE PERIODS THEN ENDED
[/LEGEND]
       
<S>                             <C>                     <C>                     <C>
[PERIOD-TYPE]                   3-MOS                   6-MOS                   9-MOS
[FISCAL-YEAR-END]                          DEC-31-1996             DEC-31-1996             DEC-31-1996
[PERIOD-START]                             JAN-31-1996             JAN-01-1996             JAN-01-1996
[PERIOD-END]                               MAR-31-1996             JUN-30-1996             SEP-30-1996
[CASH]                                         329,298                 304,812                 357,278
[SECURITIES]                                         0                       0                       0
[RECEIVABLES]                                  165,510                 194,211                 143,471
[ALLOWANCES]                                         0                       0                       0
[INVENTORY]                                          0                       0                       0
[CURRENT-ASSETS]                               494,808                 499,023                 500,749
[PP&E]                                       4,868,136               4,780,396               4,732,995
[DEPRECIATION]                               2,327,157               2,342,552               2,386,660
[TOTAL-ASSETS]                               3,035,788               2,936,867               2,847,084
[CURRENT-LIABILITIES]                                0                       0                       0
[BONDS]                                              0                       0                       0
[PREFERRED-MANDATORY]                                0                       0                       0
[PREFERRED]                                          0                       0                       0
[COMMON]                                             0                       0                       0
[OTHER-SE]                                   3,035,788               2,936,867               2,847,084
[TOTAL-LIABILITY-AND-EQUITY]                 3,035,788               2,936,867               2,847,084
[SALES]                                              0                       0                       0
[TOTAL-REVENUES]                               178,095                 334,649                 486,025
[CGS]                                                0                       0                       0
[TOTAL-COSTS]                                   74,202                 147,114                 220,717
[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]                                   116,800                 228,095                 329,124
[EPS-PRIMARY]                                        0                       0                       0
[EPS-DILUTED]                                        0                       0                       0
        

</TABLE>