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Microscopic Study of Elkhorn Coal Bed at Jenkins, Letcher County, Ky., by Reinhardt Thiessen, George C. Sprunk and H.J. O'Donnell ...

Reinhardt ThiessenH.-J. O'DonnellGeorge C. Sprunk

出版	U.S. Government Printing Office, 1931
URL	http://books.google.com.hk/books?id=rbBAQwAACAAJ&hl=&source=gbs_api