This primary source comes from the Records of the Office of the Chief of Engineers.
Full Citation: Map showing the location of Military Posts, Indian Reservations and Principal Routes in the States and Territories Comprising the Military Division of the Missouri; 1872; United States; Civil Works Map File, 1818 - 1947; Records of the Office of the Chief of Engineers, Record Group 77; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/map-showing-location-military-posts-indian-reservations-and-principal-routes, May 28, 2022]