- Alexander Campbell Martin, Arthur Henry Senner, C. C. Plummer, C. H. Hadley, Chalmers Jackson King, Curtis Paul Clausen, David A. Savage, Ernest Victor Abbott, Frederick Charles Lincoln, Glenn Gardner Hahn, Harold Francis Scholz, Harold Glenn Meginnis, J. Clark Salyer, James Herbert Beattie, Jenkin William Jones, Mayne Reid Coe, Paul William Miller, Ralph P. Hotis, Robert J. Sim, United States. Department of Agriculture, Walter Ernest Fleming, Wilbur Clifford Edmundson, Wilbur Magruder Hurst, Claude Hope, Frederick William Metzger, Ira Myron Hawley, James Robert McCalmont, John Walter Taylor, Victor Rickman Boswell, Walter Raymond Humphries, William Ernest Stone, E. E. Hall, Max Raymond Osburn, Roland McKee
· 1934
- William Kinsey Williams, Altus Lacy Quaintance, Archibald Dixon Shamel, Arthur Henry Senner, Arthur Maxwell Brunson, G. A. Collier, George Charles Husmann, Harold Glenn Meginnis, Harold Pearl Sheldon, Harvey Leroy Westover, Helmut Charles Diehl, John Robert Parker, Justus Watson Folsom, Kenneth Hayes Myers, Leonard Lee Harter, Orator Fuller Cook, Perkins Coville, Ralph Leroy Parshall, Raymond R. Pailthorp, Thomas William Heitz, Waldo Lee McAtee, Wallace Ashby, Archie Hubbard Glaves, Charles Ranger Enlow, Erval Jackson Newcomer, Frank G. Grimes, Harry August Schoth, Jacob Martin Lutz, James William Park, William John Zaumeyer, William Randolph Walton, Albert Lloyd Ryall, Arthur Truman Semple, Bennet Allen Porter
· 1931
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No image available
A. F. Burgess, Alonzo Clayton Davis, B. L. Wade, Bascom Anthony Belcher, C. C. Plummer, Charles Edwin Kellogg, Clarence Elbert Clement, Ellsworth Zouave Russell, Frank R. Smith, Harold Glenn Meginnis, James William Park, John Samuel Bengston, Martin Leatherman, Millard Curtiss Swingle, Ole Anker Nelson, P. M. Lombard, Raymond Price, Roderick Sprague, Thomas Henry Jones, Victor Leo Stedronsky, Wilbur Magruder Hurst, William Allison Lloyd, William Cecil Crow, William Norwood Sparhawk, R. W. Leukel, Ray Trask Webber, Robert Elsmere Hutton, S. F. Sherwood, Walter Raymond Humphries, Whiteford Lee Baker, William John Zaumeyer, Leonard Lee Harter, Philip B. Dowden· 1937
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No image available