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Taxonomy and Paleobiology of Some Middle Cambrian Scenella (Cnidaria) and Hyolithids (Mollusca) from Western North America

L. E. BabcockRichard A. Robison

出版	University of Kansas, 1988
URL	http://books.google.com.hk/books?id=_wsVOPZoxM0C&hl=&source=gbs_api