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Tertiary and Quaternary Pectens of California, by Ralph Arnold. [U.S. Geological Survey Professional Paper No. 47. Series C, Systematic Geology and Paleontology, 76.].

Ralph ArnoldUnited States. Congress. House

出版	U.S. Government Printing Office, 1906
URL	http://books.google.com.hk/books?id=aYYJYAAACAAJ&hl=&source=gbs_api