U.S. Land Sales within Limits of the N.P.R.R. Cos. Land Grant for the Year Ending June 30, 1882, ser. C, Settlement and Development, NP Papers, 1864-1920, r. 3.

For declining sales, Report, Land Sales, to Henry Villard, Aug. 11, 1882, ser. C, Settlement and Development, NP Papers, 1864-1920, r. 3.

See Chart M. "Land Settlement in North Dakota and South Dakota Counties," below or in the appendix. Spatial History Project, Stanford Univ.