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Sulfate <br />Colowyo Coal Company L.P <br />2000 <br />1500 <br />m 1000 <br />9 <br />1 500 <br />0 <br />O NGSW <br />09/89 09/91 09/93 09/95 09/97 <br />09/99 09/01 <br />Date <br />