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This collection consists of three notebooks or field books kept by Fletcher G. Downs and a copy of his 1908 mining thesis, Gilpin County Colorado. The notebooks (I, II and IV) record Down's "Mine Trip" during the Summer of 1907. The books include drawings and schematics of equipment (pumps, shaft guides, brakes, gears, drainage valves, etc.) and field details of the West Vulcan mines.