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1by Helley, Edward J.“...U.S. Geological Survey ; [U.S. Geological Survey],...”
Published 1991
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2Published 1978“...The Survey ; U.S. Geological Survey,...”
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5Published 1998“...U.S. Geological Survey,...”
Government Document Book -
6by Brown, Larry R.“...U.S. Geological Survey,...”
Published 1998
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7Published 1998“...U.S. Geological Survey,...”
Government Document Microform Book -
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9Published 1999“...U.S. Geological Survey,...”
Government Document Book -
10by Page, Robert A.“...U.S. Geological Survey,...”
Published 1999
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17Published 1979“...U.S. Geological Survey,...”
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18Published 1981“...U.S. Geological Survey,...”
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20Published 1981“...U.S. Geological Survey,...”
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