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<br />POND 86 Mg, (Dissolved <br />14 <br />12 <br />10 <br />mg/1 <br />6 <br />4 <br />2 <br />0 <br /> <br />~ MIN. <br />® MEAN <br />® MAX. <br />. ~ ....._, v _._.. __ .. _. <br />1987 1986 1985 1984 1983 <br />