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r, <br /> Mid—Continent <br /> SODIUM <br /> 500 <br /> 400 <br /> 300 <br /> co <br /> z <br /> 200 <br /> 100 <br /> ■ <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 />