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1Published 1984“...U.S. Geological Survey,...”
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2Published 1990“...U.S. Geological Survey ;...”
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3Published 1991“...U.S. Geological Survey ;...”
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4Published 1992“...U.S. Geological Survey ;...”
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5Published 1993“...U.S. Geological Survey ;...”
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6Published 1993“...U.S. Geological Survey :...”
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7Published 1993“...U.S. Geological Survey :...”
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8Published 1994“...U.S. Geological Survey ;...”
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9Published 1994“...U.S. Geological Survey ;...”
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10by Gutentag, Edwin D., 1931-“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1974
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