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Use of a Large-diameter Auger in Mining Anthracite Beds

John T. SchimmelW. H. TavennerDonald Markle

出版	U.S. Department of the Interior, Bureau of Mines, 1962
URL	http://books.google.com.hk/books?id=nRbIYQ6o_6YC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN