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Downtown District of Leadville, Colorado, by Samuel Franklin Emmons and John Duer Irving. [U.S. Geological Survey Bulletin No. 320. Series A, Economic Geology, 101. Series B, Descriptive Geology, 123.].
出版U.S. Government Printing Office, 1907
URLhttp://books.google.com.hk/books?id=OlebXwAACAAJ&hl=&source=gbs_api