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Safety Achievements of a Pennsylvania Bituminous-coal Mine and of a Coal-mine Superintendent

Francis Feehan

出版	U.S. Department of Commerce, Bureau of Mines, 1930
URL	http://books.google.com.hk/books?id=6xIoFuRY3lkC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN