WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  


<ARTICLE>                     5
<CIK>                         882074                                         
        
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1996
<PERIOD-END>                                   JUN-30-1997
<CASH>                                          1,353,000
<SECURITIES>                                    1,701,000
<RECEIVABLES>                                   6,030,000
<ALLOWANCES>                                       0
<INVENTORY>                                        0
<CURRENT-ASSETS>                                9,636,000
<PP&E>                                        151,014,000 
<DEPRECIATION>                                 88,180,000
<TOTAL-ASSETS>                                 74,841,000
<CURRENT-LIABILITIES>                           6,033,000
<BONDS>                                            0
<PREFERRED-MANDATORY>                              0
<PREFERRED>                                        0
<COMMON>                                          143,000
<OTHER-SE>                                     40,604,000
<TOTAL-LIABILITY-AND-EQUITY>                   74,841,000
<SALES>                                        14,287,000
<TOTAL-REVENUES>                               14,287,000
<CGS>                                              0
<TOTAL-COSTS>                                  11,936,000
<OTHER-EXPENSES>                                   60,000
<LOSS-PROVISION>                                   0
<INTEREST-EXPENSE>                              1,265,000
<INCOME-PRETAX>                                 1,146,000
<INCOME-TAX>                                       0
<INCOME-CONTINUING>                             1,146,000
<DISCONTINUED>                                     0
<EXTRAORDINARY>                                    0
<CHANGES>                                          0
<NET-INCOME>                                    1,146,000
<EPS-PRIMARY>                                         .07
<EPS-DILUTED>                                         .07