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Mining and Grinding Methods and Costs at the Malvern Clay Co. Mine, Malvern, Ohio

Edwin John Lintner

出版	U.S. Department of the Interior, Bureau of Mines, 1937
URL	http://books.google.com.hk/books?id=XP5Ic-Sc5KoC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN