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Contributions to Economic Geology, 1905, [by] S.F. Emmons, E.C. Eckel, Geologists in Charge. [U.S. Geological Survey Bulletin No. 285. Series A, Economic Geology, 73.].

United States. Congress. House

出版	1906
URL	http://books.google.com.hk/books?id=_pf0wQEACAAJ&hl=&source=gbs_api