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<br />PQND 13-7 Mg, ~ Dissolved) <br />16 <br />14 <br />12 <br />14 <br />mg/1 $ <br />6 <br />4 <br />2 <br />0 <br /> <br />^ MIN. <br />^ MEAN <br />^ MAX. <br />'/I~t_ <br />1987 1986 1985 1984 1983 <br />