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Mid—Continent <br /> CONDUCTIVITY <br /> 2000 <br /> 1500 - <br /> 1000 - <br /> Q <br /> z <br /> o <br /> 500 <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 />