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Mid—Continent <br /> MAGNESIUM <br /> 35 <br /> ■ <br /> 30 <br /> 25 - <br /> 20 <br /> an <br /> 15 <br /> 10 <br /> 5 - <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 />