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Contributions to Economic Geology, 1906. Part I. -- Metals and Nonmetals, Except Fuels, [by] S.F. Emmons, E.C. Eckel, Geologists in Charge. [U.S. Geological Survey Bulletin No. 315. Series A, Economic Geology.].

United States. Congress. House

出版	1907
URL	http://books.google.com.hk/books?id=1OjEwgEACAAJ&hl=&source=gbs_api