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Calcium ~ O A-6 <br />Colowyo Coal Company L.P <br />400 <br />300 <br />m 200 <br />9 <br />1 100 <br />0 <br />08/84 <br />08/86 OB/B8 08/90 OB/92 08/94 08/96 08/98 OB/00 <br />Date <br />