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Investigation of a Subbituminous Coal Deposit Suitable for Opencut Mining, Beluga River Coalfield, Alaska

出版	U.S. Department of the Interior, Bureau of Mines, 1963
URL	http://books.google.com.hk/books?id=fjWLAUyht54C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN