Black Hills meridian
The Black Hills meridian, longitude 104°03′ west from Greenwich, with the baseline in latitude 44° north, is the principal meridian that governs surveys in the state of South Dakota north and west of White River, and west of the Missouri River (between latitudes 45°55′20″ and 44°1′30″), the north and west boundaries of the Lower Brule Indian Reservation, and the west boundary of range 79 west, of the Fifth Principal Meridian system. It is named for the Black Hills of South Dakota and Wyoming.
- Raymond, William Galt (1914). Plane Surveying for Use in the Classroom and Field (via Google Books). New York: American Book Company.
- "Cadastral Survey, 5th Principal Meridian North Detail". U.S Bureau of Land Management. Retrieved 2012-09-21.
- "Black Hills Principal Meridian". Principal Meridian Project. Retrieved 2012-09-21.
- "Black Hills Principal Meridian". The Center for Land Use Interpretation. Retrieved 2012-09-21.