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Age of the Bedford Shale, Berea Sandstone and Sunbury Shale in the Appalachian and Michigan Basins, Pennsylvania and Michigan, and Ohio

Geological Survey (U.S.)

出版	U.S. Government Printing Office, 1968
URL	http://books.google.com.hk/books?id=sGeLwgEACAAJ&hl=&source=gbs_api