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

其他書名	1951-1952
出版	U.S. Department of the Interior, Bureau of Mines., 1952
URL	http://books.google.com.hk/books?id=TNmd5E_yHVMC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN