<ARTICLE> 5 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> SEP-30-1997 <CASH> 127,526 <SECURITIES> 0 <RECEIVABLES> 47,742 <ALLOWANCES> 44,992 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 856,786 <DEPRECIATION> 786,138 <TOTAL-ASSETS> 202,156 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 190,155 <TOTAL-LIABILITY-AND-EQUITY> 202,156 <SALES> 0 <TOTAL-REVENUES> 165,589 <CGS> 0 <TOTAL-COSTS> 127,232 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 38,357 <INCOME-TAX> 0 <INCOME-CONTINUING> 38,357 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 38,357 <EPS-PRIMARY> 0 <EPS-DILUTED> 0