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Administration of the Federal Coal-Mine Safety Act, Calendar Year 1956

James WestfieldH. F. WeaverC. M. Keenan

出版	U.S. Department of the Interior, Bureau of Mines, 1957
URL	http://books.google.com.hk/books?id=sRJutXbfXkEC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN