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<br />SPRING & POND 17 Mg, (Dissolved) <br /> <br />mg/1 <br /> <br />20 <br />18 <br />16 <br />14 <br />12 <br />to <br />8 <br />6 <br />4 <br />2 <br />0 <br />^ MIN. <br />^ MEAN <br />^ MAX. <br />S:~u 4..:.w.o- <br />1987 1986 1985 1984 1983 <br />