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1“...Geological Survey bulletin ;...”
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2by Keith, William J., 1933-“...Geological Survey bulletin ;...”
Published 1977
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3Published 1988“...U.S. Geological Survey bulletin ;...”
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4Published 1987“...U.S. Geological Survey bulletin ;...”
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5Published 1986“...U.S. Geological Survey bulletin ;...”
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6by Keith, William J., 1933-“...U.S. Geological Survey bulletin ;...”
Published 1988
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7by Keith, William J., 1933-“...U.S. Geological Survey bulletin ;...”
Published 1987
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8by Keith, William J., 1933-“...U.S. Geological Survey bulletin ;...”
Published 1986
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