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1by Schreffler, Curtis L.“...U.S. Geological Survey,...”
Published 1996
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2by Schreffler, Curtis L.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2001
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Government Document Book -
3by Schreffler, Curtis L.“...U.S. Dept. of the Interior, U.S. Geological Survey ; Earth Science Information Center, Open-File...”
Published 1996
Government Document Book