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Coal-mine Accidents in the United States, 1934

William Waugh AdamsL. E. GeyerM. G. Parry

出版	U.S. Department of the Interior, Bureau of Mines, 1936
URL	http://books.google.com.hk/books?id=6z_A9sdC2SwC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN