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1by Kjelstrom, L. C.“...U.S. Geological Survey,...”
Published 1988
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2by Clark, G. M. (Gregory M.), 1958-“...U.S. Geological Survey,...”
Published 1997
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3by Rupert, Michael G., 1965-“...U.S. Geological Survey,...”
Published 1994
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4by Kjelstrom, L. C.“...U.S. Geological Survey,...”
Published 1995
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5“...U.S. Department of the Interior, U.S. Geological Survey,...”
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