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Active List of Permissible Explosives and Blasting Devices Approved Before December 31, 1975
J. RibovichRichard William WatsonJ. J. Seman
出版U.S. Department of the Interior, Mining Enforcement and Safety Administration, 1976
URLhttp://books.google.com.hk/books?id=B8NnZ6cT3vcC&hl=&source=gbs_api
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