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HUMIDITY CELL TESTS <br />Cumulative Sulfate from Samples <br />,-. <br />rn <br />E <br />0 <br />0 <br />.~ <br />v <br />W <br />H <br />Q <br />t1 <br />J <br />w <br />H <br />v <br />12 <br />11 <br />10 <br />9 <br />8 <br />7 <br />6 <br />5 <br />4 <br />3 <br />2 <br />0 <br />11 12 13 14 <br />15 16 17 <br />TIME (weeks) <br />