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Geology of Niobrara State Park, Knox County, Nebraska, and Adjacent Areas, with a Brief History of the Park, Gavins Point Dam, and Lewis and Clark Lake

出版	Conservation and Survey Division, Institute of Agriculture and Natural Resources, University of Nebraska-Lincoln, 1997
URL	http://books.google.com.hk/books?id=j4Aklt0J1O4C&hl=&source=gbs_api