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Stratigraphy of the pierre shale, Valley City and Pembina Mountain Areas

其他書名	North Dakota. By James R. Gill and William A[ubrey] Cobban. [Mit Illustr.].
出版	U.S. Government Printing Office, 1965
URL	http://books.google.com.hk/books?id=MneUPgAACAAJ&hl=&source=gbs_api