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Calcium <br />Colowyo Coal Company L.P. <br />400 <br />300 <br />m 200 <br />9 <br />1 100 <br />0 <br />09/89 <br />09/91 09/93 <br />O NGSW <br />09/95 09/97 09/99 09/01 <br />Date <br />