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HUMIDITY CELL TESTS <br />Cumulative Sulfate from Samples <br />m <br />E <br />m <br />M <br />O <br />M <br />W <br />F <br />._ <br />4 <br />J <br />7 <br />N <br />W <br />J <br />f <br />._ <br />J <br />F <br />U <br />60 <br />50 <br />40 <br />30 <br />20 <br />10 <br />0 <br />20 22 24 26 28 30 <br />^ 3QTR96 <br />TIME (weeks) <br />