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Contributions to Economic Geology (short Papers and Preliminary Reports), 1925. Part I. -- Metals and Nonmetals Except Fuels, [by] G.F. Loughlin and G.R. Mansfield, Geologists in Charge. [U.S. Geological Survey Bulletin 780.].

United States. Congress. House

出版	1925
URL	http://books.google.com.hk/books?id=oxfbwQEACAAJ&hl=&source=gbs_api