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Some Aspects of the Coal Industry of the U.S.S.R.

George MarkonGeorge D. Drechsler

出版	U.S. Department of the Interior, Bureau of Mines, 1959
URL	http://books.google.com.hk/books?id=2X8uU9nRTwEC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN