<ARTICLE> 5 <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> DEC-31-1997 <CASH> 104,309 <SECURITIES> 0 <RECEIVABLES> 68,001 <ALLOWANCES> (8,393) <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 1,527,504 <DEPRECIATION> (1,449,772) <TOTAL-ASSETS> 242,209 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 227,765 <TOTAL-LIABILITY-AND-EQUITY> 242,209 <SALES> 0 <TOTAL-REVENUES> 473,344 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 357,878 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 115,466 <INCOME-TAX> 0 <INCOME-CONTINUING> 115,466 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 115,466 <EPS-PRIMARY> 1.71 <EPS-DILUTED> 1.71