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Active List of Permissible Explosives and Blasting Devices Approved Before July 1, 1970

P. A. RichardsonC. M. Mason

出版	U.S. Department of the Interior, Bureau of Mines, 1970
URL	http://books.google.com.hk/books?id=7h9CGQ_1_sQC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN