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West Virginia Coals from the Pittsburgh Bed, Jamison No. 9 Mine, Marion County and Upper Freeport Bed, Bull Run No. 1 Mine, Preston County
出版U.S. Government Printing Office, 1951
URLhttp://books.google.com.hk/books?id=j0IJP4etlKoC&hl=&source=gbs_api
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