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Extracting Final Stump in Pillars and Pillar Lifts with Continuous Miners

R. Ward Stahl

出版	U.S. Department of the Interior, Bureau of Mines, 1960
URL	http://books.google.com.hk/books?id=xAG888Y8bfUC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN