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Coal-mine Accidents in the United States, 1935

William Waugh AdamsL. E. GeyerM. G. Parry

出版	U.S. Department of the Interior, Bureau of Mines, 1938
URL	http://books.google.com.hk/books?id=f4vBWph2su4C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN