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Ammonites and Some Characteristic Bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming

William A. Cobban

出版	U.S. Government Printing Office, 1990
URL	http://books.google.com.hk/books?id=yV-QAQK4VskC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN