<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> JUN-30-1997 <CASH> 2,639,480 <SECURITIES> 0 <RECEIVABLES> 1,385,965 <ALLOWANCES> (677,123) <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 71,750,461 <DEPRECIATION> (34,198,717) <TOTAL-ASSETS> 41,899,200 <CURRENT-LIABILITIES> 0 <BONDS> 7,184,107 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 33,207,011 <TOTAL-LIABILITY-AND-EQUITY> 41,899,200 <SALES> 4,570,896 <TOTAL-REVENUES> 4,644,577 <CGS> 2,373,714 <TOTAL-COSTS> 4,002,602 <OTHER-EXPENSES> 499,278 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 417,013 <INCOME-PRETAX> (274,316) <INCOME-TAX> 0 <INCOME-CONTINUING> (274,316) <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> (274,316) <EPS-PRIMARY> 0 <EPS-DILUTED> 0