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Elementary Guide to the Fossils and Strata of the Ordovician in the Vicinity of Cincinnati, Ohio

Walter Hermann BucherKenneth Edward CasterElizabeth A. DalveJohn K. Pope

出版	Cincinnati Museum of Natural History, 1961
URL	http://books.google.com.hk/books?id=TcMoAQAAMAAJ&hl=&source=gbs_api