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Contributions to Economic Geology (short Papers and Preliminary Reports, 1930

其他書名	Part I. - Metals and Nonmetals Except Fuels
出版	U.S. Government Printing Office, 1931
URL	http://books.google.com.hk/books?id=j3I2w2QA42MC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN