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3by Kay, Robert T.“...U.S. Geological Survey,...”
Published 1997
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4Published 1996“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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5Published 1997“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Government Document Book -
6by Kay, Robert T.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 2002
Government Document Book