Contents Note: History of Colorado, by W. B. Vickers.--History of Gilpin County, by James Burrell.--History of Clear Creek County, by Aaron Frost.--History of Jefferson County, by E. L. Berthoud.--History of Boulder County, by A. Bixby.--Gilpin County, Biographical.--Clear Creek County, Biographical.--Jefferson County Biographical.--Boulder County, Biographical.