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<br />SPRING & POND 20 TDS <br />~J <br />mgll <br /> <br />400 <br />350 <br />300 <br />250 <br />200 <br />iso <br />100 <br />50 <br />0 <br />~ MIN. <br />~ MEAN <br />o MAx. <br /> <br />1987 1986 1985 1984 1983 <br />