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Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River Basin, Montana and Wyoming
Douglas J. NicholsJanet L. Brown
出版U.S. Government Printing Office, 1992
URLhttp://books.google.com.hk/books?id=U4HOTFS_FhkC&hl=&source=gbs_api
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