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U <br />25 <br />20 <br />i5 <br />mg/1 <br />10 <br />5 <br />0 <br /> <br />. ._.~. _. <br />POND $5 Mg, ~Dissalved~ <br /> <br />~ MIN. <br />®MEAN <br />MAX. <br /> <br />19$7 1986 1985 1984 1983 <br />