Supplement to Farming in the Great Plains by Floyd E. Moeller, Thomas James Army, Orus L. Bennett, John Milton Webber, Erling Hole, August Ludwig Hormay, Claude Carl Wakeland, Frank D. Whisler, George A. Pearson, James X. King, Jesse Raymond Thomas, John Leo Schwendiman, Morris M. Lindsey, Warren Richards Bailey, Alvin Dearing Ayers, Donald S. Douglas, J. H. Zeller, James Vermeer, Ronald Owens Aines, Atlee Lawrence Hafenrichter, Edwin Lory Cox, Herbert Ottmar Hetzer