<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the Form
10Q financial statements filed for the period ending December 31, 1996 and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1997
<PERIOD-START>                             JUL-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                           5,260
<SECURITIES>                                         0
<RECEIVABLES>                                   11,223
<ALLOWANCES>                                         0
<INVENTORY>                                      1,548
<CURRENT-ASSETS>                                18,256
<PP&E>                                         134,253
<DEPRECIATION>                               (103,396)
<TOTAL-ASSETS>                                  49,252
<CURRENT-LIABILITIES>                           11,787
<BONDS>                                         10,698
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                      22,287
<TOTAL-LIABILITY-AND-EQUITY>                    49,252
<SALES>                                         17,248
<TOTAL-REVENUES>                                19,446
<CGS>                                            7,942
<TOTAL-COSTS>                                    8,380
<OTHER-EXPENSES>                                 3,369
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 656
<INCOME-PRETAX>                                  7,041
<INCOME-TAX>                                     3,008
<INCOME-CONTINUING>                              4,033
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                     18
<CHANGES>                                            0
<NET-INCOME>                                     4,051
<EPS-PRIMARY>                                    2,896
<EPS-DILUTED>                                        0