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1by Melvin, Robert L.“...U.S. Geological Survey ;...”
Published 1988
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3by Melvin, Robert L.“...U.S. Geological Survey,...”
Published 1995
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4by Melvin, Robert L.“...U.S. Geological Survey,...”
Published 1995
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5Published 1987“...Dept. of the Interior, U.S. Geological Survey :...”
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6by Melvin, Robert L.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1991
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7Published 1992“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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8Published 1995“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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9Published 1995“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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