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Methods and Costs of Sinking the Silver Summit Shaft, Wallace, Idaho, Using a Mechanical Mucking Machine

出版	U.S. Department of the Interior, Bureau of Mines, 1948
URL	http://books.google.com.hk/books?id=nLE_Aw16Gz0C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN