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Sinking No. 3 Shaft at Westvaco Trona Mine, Intermountain Chemical Co., Sweetwater County, Wyo

F. L. WidemanC. A. RomanoT. Berry

出版	U.S. Department of the Interior, Bureau of Mines, 1959
URL	http://books.google.com.hk/books?id=sTVxJT760ZYC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN