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Heptranchias Howellii (Reed, 1946) (Selachii, Hexanchidae) in the Eocene of the United States and British Columbia

Bruce J. Welton

出版	University of California, Museum of Paleontology, 1974
URL	http://books.google.com.hk/books?id=SoYfAQAAIAAJ&hl=&source=gbs_api