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Estimate of Known Recoverable Reserves of Coking Coal in Letcher County, Ky

Joseph J. WallaceJames J. DowdRaymond G. TravisR. F. AbernethyD. A. Reynolds

出版	U.S. Department of the Interior, Bureau of Mines, 1953
URL	http://books.google.com.hk/books?id=P36Kq-3RmioC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN