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r~ <br />POND 8$, SULFATE <br />25 <br />20 <br />15 <br />mg/1 <br />10 <br />5 <br />0 <br /> <br />~ MIN. <br />S MEAN <br />® MAX. <br />>Y.., :~r.:`icim3~~ ~.s ?Sx~.`.~'1`ilalst;s'~;.k~'.~i...~~.,. , , ~.~,.:.ws: c.Y....-=Sv.S+~-i. ~_'.~r.'.. i ~4u _ .~. ~. E4s'; „ . , ' <br />1987 1986 1985 1984 1983 <br />