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Contributions to Economic Geology, 1902, [by] S.F. Emmons [and] C.W. Hayes, Geologists in Charge. [U.S. Geological Survey Bulletin No. 213. Series A, Economic Geology, 24.].

United States. Congress. House

出版	1903
URL	http://books.google.com.hk/books?id=oGhQzQEACAAJ&hl=&source=gbs_api