by Alfred Leroy Baker, Benton Mehrling Stahl, Charles William Loomer, Claude Kedzie Shedd, Donald Eisenbrey Church, Edward Pendleton Carter, Elsa Orent-Keiles, Fenner Satterthwaite Stickney, Frank Custer Edminster, Harry Curtis Young, Hazel Marie Fletcher, Herbert Halden Walkden, James Robert Dawson, Joseph Bailey Edmond, Leo E. Holman, M. A. Yothers, Marshall Tracy Deonier, Matthew Drosdoff, Myron Francis Babb, Ralph Dickieson Jennings, Ralph Leroy Parshall, Robert Douglass McCulley, Roy Wesley Nixon, Tom Part Cassidy, W. P. Baird, United States. Department of Agriculture, Arnold M. Hansen, David Victor Kopland, Dwight Fletcher Barnes, Frank Waldemar Carlson, George Yankush Young, James E. Kraus, Maurice E. Dahmus, Vernon Webster Johnson, Walter S. Atkinson, William Henry Black, Arthur Clifton McIntyre, Mary Ellen Duensing, Perez Simmons, Roy Magruder

1950

by Arthur Clifton McIntyre, Charles Franklin Noll, Francis Janney Doan, Frederick Fouse Lininger, H. B. Josephson, John Earl McCord, Otto Olson, Ralph Porter Tittsler

1928