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Geology and Fluorspar Deposits, Northgate District, Colorado

Thomas August Steven

出版	U.S. Government Printing Office, 1960
URL	http://books.google.com.hk/books?id=NqYPAAAAIAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Prepared in cooperation with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund Board.