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1Published 2005“...Fact sheet (Geological Survey (U.S.)) ;...”
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2Published 2002“...Fact sheet (Geological Survey (U.S.)) ;...”
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3by May, Christine“...Fact sheet (Geological Survey (U.S.)) ;...”
Published 2004
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4Published 2004“...Fact sheet (Geological Survey (U.S.)) ;...”
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5Published 2005“...Fact sheet (Geological Survey (U.S.)) ;...”
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6Published 2005“...Fact sheet (Geological Survey (U.S.)) ;...”
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7Published 2005“...Fact sheet (Geological Survey (U.S.)) ;...”
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8by Waldien, David L.“...Fact sheet (Geological Survey (U.S.)) ;...”
Published 2006
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Government Document Book