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Sinking Methods and Costs at the Burgin Shaft, Bear Creek Mining Co., East Tintic Project, Utah County, Utah

Floyd Davis Everett

出版	U.S. Department of the Interior, Bureau of Mines, 1959
URL	http://books.google.com.hk/books?id=cEbpnEVXAg0C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN