<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONDENSED
CONSOLIDATED BALANCE SHEETS AND FROM CONSOLIDATED STATEMENTS OF EARNINGS AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               MAR-31-1998
<CASH>                                           2,563
<SECURITIES>                                         0
<RECEIVABLES>                                  564,175
<ALLOWANCES>                                         0
<INVENTORY>                                    313,036
<CURRENT-ASSETS>                               926,814
<PP&E>                                       3,498,897
<DEPRECIATION>                             (1,667,501)
<TOTAL-ASSETS>                               2,965,609
<CURRENT-LIABILITIES>                          796,433
<BONDS>                                        593,261
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        15,619
<OTHER-SE>                                   1,262,733
<TOTAL-LIABILITY-AND-EQUITY>                 2,965,609
<SALES>                                      1,018,009
<TOTAL-REVENUES>                             1,038,203
<CGS>                                          838,794
<TOTAL-COSTS>                                   87,770
<OTHER-EXPENSES>                                87,391
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               8,863
<INCOME-PRETAX>                                 15,385
<INCOME-TAX>                                     5,363
<INCOME-CONTINUING>                             10,022
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    10,022
<EPS-PRIMARY>                                     0.32
<EPS-DILUTED>                                     0.00