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Paleoecology of Pseudozaphrentoides Verticillatus (Barbour) in the Plattsmouth Limestone (Pennsylvanian)

Robert Francis Diffendal

出版	University of Nebraska (Lincoln campus)--1964., 1964
URL	http://books.google.com.hk/books?id=SMleNwAACAAJ&hl=&source=gbs_api