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Block-caving Mining Methods and Costs Bagdad Mine, Bagdad Copper Corp. Yavapai County, Ariz

William R. Hardwick

出版	U.S. Department of the Interior, Bureau of Mines, 1959
URL	http://books.google.com.hk/books?id=7SwNbvwq-GkC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN