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Cenozoic and Cretaceous Echinoids from Trinidad and Venezuela

Charles Wythe CookeDavid Crockett GrahamRobert E. SnodgrassWilliam A. Gosline

出版	Smithsonian Institution, 1962
URL	http://books.google.com.hk/books?id=pNsi4GQMmSQC&hl=&source=gbs_api