<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> JUN-30-1998 <CASH> 2,267,147 <SECURITIES> 0 <RECEIVABLES> 0 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 2,267,147 <PP&E> 22,395,185 <DEPRECIATION> 19,583,532 <TOTAL-ASSETS> 5,078,800 <CURRENT-LIABILITIES> 516,073 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 4,562,727 <TOTAL-LIABILITY-AND-EQUITY> 5,078,800 <SALES> 13,453,500 <TOTAL-REVENUES> 13,544,631 <CGS> 0 <TOTAL-COSTS> 714,151 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 12,830,480 <INCOME-TAX> 0 <INCOME-CONTINUING> 0 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 12,830,480 <EPS-PRIMARY> .88 <EPS-DILUTED> .88