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C~ <br />POND 13-8 Ca, (Dissolved) <br />45 <br />40 <br />35 <br />30 <br />• mg~l 20 <br />15 <br />10 <br />5 <br />0 <br /> <br />~ MIN. <br />~ MEAN <br />^ MAX. <br />'~4ii*F.aS~~.e.4~.~Cti '~ ~ ~ .:~,~ `:~,'i~~..a~.a g " .~.as~.'~~~ -~ ~tt <br />1987 1986 1985 1984 1983 <br />