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National Water-Quality Assessment Program (U.S.)
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2001
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1998
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United States. Environmental Protection Agency. Office of Water.
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2008
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United States. Environmental Protection Agency. Office of Water.
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2008
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Geological Survey (U.S.)
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1998
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Geological Survey (U.S.)
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1998
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2002
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1999
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1998
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1997
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Geological Survey (U.S.)
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2001
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Thiros, Susan A.
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2000
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