[Map of western United States showing military departments].between 1868 and 1889?]Also shows principal mail routes and railroads.Dakota Territory appears reduced to present area (1868), but before it was divided into North Dakota and South Dakota (1889).Includes inset of "The territory of north western America, ceded by Russia to the United States, 1868" (scale 1:9,000,000).Library's copy missing bottom right sheet and top two sheets are joined. Bottom left sheet blind stamped, "Boston Public Library."Relief shown by hachures and spot heights.Title devised by cataloger.cartographic