<ARTICLE>                                  5


                                  
<PERIOD-TYPE>                               6-MOS
<FISCAL-YEAR-END>                           DEC-31-1999
<PERIOD-START>                              JAN-01-1999
<PERIOD-END>                                JUN-30-1998

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<SECURITIES>                                          0
<RECEIVABLES>                                 4,856,000
<ALLOWANCES>                                 (3,323,000)
<INVENTORY>                                           0
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<PP&E>                                       82,055,000
<DEPRECIATION>                              (60,770,000)
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<CURRENT-LIABILITIES>                         6,869,000
<BONDS>                                               0
<PREFERRED-MANDATORY>                                 0
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<COMMON>                                      1,723,000
<OTHER-SE>                                   17,234,000
<TOTAL-LIABILITY-AND-EQUITY>                 26,194,000
<SALES>                                       4,328,000
<TOTAL-REVENUES>                              5,725,000
<CGS>                                         2,177,000
<TOTAL-COSTS>                                 2,177,000
<OTHER-EXPENSES>                              7,677,000
<LOSS-PROVISION>                                      0
<INTEREST-EXPENSE>                              286,000
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<EXTRAORDINARY>                                       0
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<EPS-BASIC>                                     0.150
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