Dakota Territory. Department of Immigration and Statistics. , and Rand McNally and Company. "Official map of the territory of Dakota, showing the two general divisions of Dakota, South and North, the land districts, Indian reservations, counties, towns and railroads." Map. 1886. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:4m90fb34f (accessed February 17, 2019).