Approaches to Income Improvement in Agriculture by Oris T. Robertson, Henry Howard Finnell, Oscar K. Barnes, Robert Warren Cooper, Clifford Scharff Schopmeyer, William H. Davis McGregor, Charles Scott Shaw, Oliver L. McCaskill, Gerald N. Franks, Anselm Clyde Griffin, Thomas James Army, Warren Durward Hanson, Neal P. Woodruff, Albert S. Hunter, Donald Douglas Durost, Jose Vicente-Chandler, Miron L. Heinselman, Norris W. Gilbert, Ralph Dickieson Jennings, Walter E. Chapman, William E. Hendrix, William S. Chepil, Donald S. Black, Fernando Abruna, Glen Thomas Barton, Lauren M. Burtch, Victor Leo Stedronsky, Cuthbert Henry McDowell, Dennis H. Currie, Servando Silva