Dakota Territory. Department of Immigration and Statistics. "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. Chicago: Rand McNally & Co., 1886. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:4m90fb34f (accessed April 25, 2024).