<ARTICLE> 5 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> MAR-31-1998 <CASH> 102,485 <SECURITIES> 0 <RECEIVABLES> 34,395 <ALLOWANCES> 32,220 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 316,403 <DEPRECIATION> 299,187 <TOTAL-ASSETS> 123,196 <CURRENT-LIABILITIES> 0 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 119,551 <TOTAL-LIABILITY-AND-EQUITY> 123,196 <SALES> 0 <TOTAL-REVENUES> 23,517 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 16,263 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 7,254 <INCOME-TAX> 0 <INCOME-CONTINUING> 7,254 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 7,254 <EPS-PRIMARY> 0.75 <EPS-DILUTED> 0.75