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Sulfate .. O A-6 <br />Colowyo Coal Company L.P <br />600 <br />450 <br />m 300 <br />9 <br />1 150 <br />0 <br />OB/84 <br />08/86 OB/B8 08/90 08/92 08/94 08/96 08/98 OB/00 <br />Date <br />