by Adrey E. Borell, Chester J. Francis, Irvin Fay Reed, James Vermeer, M. Connor Ahrens, Marie B. Harmon, Marshall Harris, Merrill Sylvester Timmins, Norman Allen, Norman Carroll Teter, United States. Agricultural Research Service. Agricultural Engineering Research Division, W. S. Chepil, Walter Ernest Fleming, Wayland Arthur Shands, William E. Larson, Birely J. Landis, F. M. Grant, Francis Raymond Lawson, Howard Lyle Hill, Irving Rollins Starbird, Neal P. Woodruff, Oliver W. Beale, Paul M. Scheffer, Virgil Lee Hurlburt, F. H. Siddoway, William John Reid

1960