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Tests of Salt as a Substitute for Rock Dust in Prevention of Coal-dust Explosions in Mines

Harold Putnam GreenwaldHenry C. HowarthIrving Hartmann

出版	U.S. Department of the Interior, Bureau of Mines, 1940
URL	http://books.google.com.hk/books?id=8JqQF16cJ2YC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN