The Sixth Principal Meridian extends from the base line 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 base line 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.