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Taphonomic Analysis and Systematic Desciptions of Some Late Pennsylvanian and Early Permian Crinoids from Southeastern Nebraska, Eastern Kansas and Southwestern Iowa

Roger K. PabianWilliam J. Rushlau

出版	Conservation and Survey Division, Institute of Agriculture and Natural Resources, University of Nebraska-Lincoln, 2002
URL	http://books.google.com.hk/books?id=FSMogEhHF5YC&hl=&source=gbs_api