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1Published 1980“...U.S. Geological Survey,...”
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2by Pool, D. R.“...U.S. Geological Survey ;...”
Published 1999
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3by Gungle, Bruce“...U.S. Geological Survey,...”
Published 2006
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8by Thomas, Blakemore E.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2006
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9by Nervick, Kevin H.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1981
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10Published 1983“...U.S. Dept. of the Interior, Geological Survey,...”
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11by Ludington, Steve“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1984
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12by Chaffee, Maurice A.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1985
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13by Abrams, G. A.“...U.S. Dept. of the Interior, Geological Survey :...”
Published 1985
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14Published 1986“...Dept. of the Interior, U.S. Geological Survey ;...”
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