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State Regulations Pertaining to the Use of Internal-combustion Engines Underground

J. C. HoltzErnest J. Gleim

出版	U.S. Department of the Interior, Bureau of Mines, 1957
URL	http://books.google.com.hk/books?id=yal8RBXq9ewC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN