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14 <br />13 <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 />A~ ALLUVIAL WELL <br />PH <br /> <br />^ <br />^ ~ + <br /> <br />1984 1985 1989 <br />YEAR <br />^ Field <br />+ Lab <br />1990 <br />1991 <br />