Sixth principal meridian
The Sixth principal meridian extends from the baseline coincident with the north boundary of Kansas in latitude 40°N south through the state to its south boundary in latitude 37°N and north through Nebraska to the Missouri River and governs the surveys in Kansas and Nebraska; the surveys in Wyoming except those referred to the Wind River meridian and base line, which intersect in latitude 43°01′20″N and longitude 108°48′40″W from Greenwich; the surveys in Colorado except those projected from the New Mexico and Ute meridians the latter intersecting its baseline in latitude 39°06′40″N and longitude 108°33′20″W from Greenwich; and the surveys in South Dakota extended or to be extended over the tract embracing the Pine Ridge and Rosebud Indian Reservations.
- Raymond, William Galt (1914). Plane Surveying for Use in the Classroom and Field (via Google Books). New York: American Book Company.
- "Cadastral Survey [sixth principal meridian]". U.S. Bureau of Land Management. Retrieved 2012-09-29.
- "Principal Meridians and Base Lines". U.S. Bureau of Land Management. Retrieved 2012-09-29.
- "The Sixth Principal Meridian, Mahaska, Kansas". Principal Meridian Project. Retrieved 2012-09-29.
- "Sixth Principal Meridian". The Center for Land Use Interpretation. Retrieved 2012-09-29.