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HUMIDITY CELL TESTS <br />Cumulative Sulfate from Samples <br />m <br />E <br />ro <br />v <br />0 <br />W <br />f <br />Q <br />4 <br />J <br />N <br />W <br />f <br />Q <br />J <br />E <br />7 <br />U <br />62 <br />SE <br />aE <br />3E <br />2E <br />SE <br />f <br />10 12 14 16 18 20 <br />^ M7 0-9(UR) <br />-~- q7 45-63(UR) <br />` NSB 75-99(UR) <br />TIME (weeks) <br />