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by Dempsey, W. J.
Washington, D.C. : The Survey, 1963
Washington, D.C. : The Survey, 1963
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by Drewes, Harald, 1927-2015
Reston, Va. : U.S. Geological Survey, 1981
Reston, Va. : U.S. Geological Survey, 1981
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by Cooper, John R. (John Roberts), 1907-
Washington, D.C. : U.S. Geological Survey, 1959
Washington, D.C. : U.S. Geological Survey, 1959
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by Cooper, John R. (John Roberts), 1907-
Washington, D.C. : U.S. Geological Survey, 1960
Washington, D.C. : U.S. Geological Survey, 1960
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