Colorado.Gray, Ormando Willis1874?]In upper right-hand margin: 132.Possibly from Gray's atlas of the United States. Philadelphia : Stedman, Brown & Lyon, 1874.Prime meridians: Greenwich and Washington.Relief shown by hachures.Shows counties formed in 1874 (e.g., La Plata and Rio Grande), but does not show counties formed in 1877 (e.g., Custer or Gunnison).cartographic