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A Survey of Potential Natural Landmarks, Geologic Themes, of the Western Central Lowland Region for Heritage Conservation and Recreation Service, Division of Natural Landmarks, U.S. Department of Interior

M. T. Szymkowicz

出版	Water Resources Research Center, Indiana University, 1981
URL	http://books.google.com.hk/books?id=4b5OAQAAIAAJ&hl=&source=gbs_api