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Calymenid and Other Ordovician Trilobites from Kentucky and Ohio

Reuben James Ross

出版	U.S. Government Printing Office, 1967
URL	http://books.google.com.hk/books?id=G-DGAC2VAtUC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Additional title page description: Species of the trilobites Iostelus, Bathyurus?, Proetidella, Gravicalymene, Flexicalymene, and Acidaspis are described from Middle and Upper Ordovician strata of Kentucky.