返回Google圖書搜尋

Permissible Explosives, Mining Equipment, and Apparatus, Approved Prior to March 15, 1922

出版	U.S. Department of the Interior, Bureau of Mines, 1922
URL	http://books.google.com.hk/books?id=4U4eSO5UZZQC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN