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HUMIDITY CELL TESTS <br />Cumulative Sulfate from Samples <br />m <br />5 <br />A <br />V <br />O <br />W <br />r <br />Q <br />W <br />J <br />7 <br />N <br />W <br />H <br />2 <br />J <br />E <br />7 <br />U <br />40 <br />30 <br />20 <br />10 <br />0 <br />10 12 14 16 10 20 <br />^ 2~95T <br />TIME (weeks) <br />