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1
著者: Popenoe, Peter
Washington, D.C. : U.S. Geological Survey, 1965
Washington, D.C. : U.S. Geological Survey, 1965
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2
著者: Petty, A. J.
Washington, D.C. : U.S. Geological Survey, 1966
Washington, D.C. : U.S. Geological Survey, 1966
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