Map of the gold regions in the vicinity of Central City, Gilpin County, Colorado Territory / from actual survey by John J. Pratt and Bela S. Buell, civil engineers and surveyors.Pratt, John J., b. 18331862"Entered according to act of Congress in the year 1862 by Wm. H. Rease in the clerk's office of the District Court of the Eastern District of Pennsylvania.""J.E. Dillingham del."Inset: Map of Colorado Territory compiled from the latest official and different private maps & surveys by F.J. Ebert, engineer & surveyor. Scale of 18 miles to one inch.cartographic