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Coal-bearing Upper Pennsylvanian and Lower Permian Rocks, Washington Area, Pennsylvania
Henry Lee Berryhill (Jr.)Stanley P. SchweinfurthBion Huntley Kent
出版U.S. Government Printing Office, 1971
URLhttp://books.google.com.hk/books?id=f2biNEayoAUC&hl=&source=gbs_api
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