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Use of Pulverized Rock as Dense Medium for Salvaging Coal from Pittsburgh-bed Refuse

Eugene Robert PalowitchT. R. JolleyM. Sokaski

出版	U.S. Department of the Interior, Bureau of Mines, 1955
URL	http://books.google.com.hk/books?id=sL-KQUw6p5gC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN