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Lower Ordovician Trilobites from the Summerford Group at Virgin Arm, New World Island, Northeastern Newfoundland

J. A. CoatesKenneth L. CurrieWilliam Thornton Dean

出版	Department of Energy, Mines and Resources, 1973
URL	http://books.google.com.hk/books?id=SbhEy96_9WEC&hl=&source=gbs_api