Hanson P.R, Arbogast A.F, Johnson W.C, Joeckel R.M, Young A.R.  2010.  Megadroughts and late Holocene dune activation at the eastern margin of the Great Plains, north-central Kansas, USA. Aeolian Research. 1(3-4):101-110.

Johnson W.C, Willey K.L, Macpherson G.L.  2007.  Carbon isotope variation in modern soils of the tallgrass prairie: Analogues for the interpretation of isotopic records derived from paleosols. Quaternary International. 162:3-20.

Johnson W.C, Willey K.L, Mason J.A, May D.W.  2007.  Stratigraphy and environmental reconstruction at the middle Wisconsinan Gilman Canyon Formation type locality, Buzzard's Roost, southwestern Nebraska, USA. Quaternary Research. 67(3):474-486.