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Contributions to Economic Geology (Short Papers and Preliminary Reports), 1929. Part I. -- Metals and Nonmetals Except Fuels. G.F. Loughlin, G.R. Mansfield, and E.F. Burchard, Geologists in Charge. [U.S. Geological Survey Bulletin 811.].

United States. Congress. House

出版	1929
URL	http://books.google.com.hk/books?id=z7TEwQEACAAJ&hl=&source=gbs_api