Map "compiled from the records of the official surveys obtained from the local United States Land Office and other authentic sources, including many actual surveys by ... Gaw."; Includes physical relief and topographic notes, trails, wagon roads, proposed and completed railroads and limits of the Northern Pacific Railroad's land grant, military forts and reservations, ranch sites, settlements, coal deposits, Indian encampments and reservations, battlefield sites, land surveys, and county boundaries.; Includes a portion of northern Jefferson County, Wyoming.; Inset contains general description of the entire area.