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Estimate of Known Recoverable Reserves of Coking Coal in Jefferson County, Pa

James J. DowdAlbert L. ToengesR. F. AbernethyD. A. Reynolds

出版	U.S. Department of the Interior, Bureau of Mines, 1952
URL	http://books.google.com.hk/books?id=Vgs9uWpNl5oC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN