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Calcium <br />Colowyo Coal Company ~.P <br />400 <br />300 <br />m 200 <br />9 <br />1 100 <br />0 <br />O NUGSC <br />10/92 10/93 10/94 10/95 10/96 <br />Date <br />• • <br />10/97 10/98 10/99 <br /> <br />