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Mid—Continent <br /> MANGANESE <br /> 0.6 <br /> 0.5 - <br /> 0.4 <br /> 0.3 <br /> 0.2 <br /> 0.1 <br /> 0 <br /> 08/28/76 05/25/79 02/18/82 11/14/84 08/11/87 05/07/90 01/31/93 10/28/95 07/24/98 <br />