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Contributions to Economic Geology (short Papers and Preliminary Reports) 1912. Part I. -- Metals and Nonmetals Except Fuels. David White, Chief Geologist. [U.S. Geological Survey Bulletin 540.].

United States. Congress. House

出版	1914
URL	http://books.google.com.hk/books?id=WY70wQEACAAJ&hl=&source=gbs_api