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Fluorspar: Its Mining, Milling, and Utilization with a Chapter on Cryolite

Raymond Bardeen Ladoo

出版	U.S. Government Printing Office, 1927
URL	http://books.google.com.hk/books?id=aRO42Qv2Py4C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN