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- Charles Adolph Weigel, Charles John Stauber, D. C. Parman, D. W. Jones, David Griffiths, Don Inskeep Skidmore, Elmer Ottis Wooton, Erastus Newton Bates, Ernst H. Wiecking, James A. Holden, John Chambers McDowell, John Clay Overpeck, Kelsey Beeler Gardner, Lloyd Stanley Tenny, Lucia McCulloch, Madge Janet Reese, Ora Stanley Fisher, Orator Fuller Cook, Raphael Zon, United States. Department of Agriculture, Ward Shepard, William Alfred Schoenfeld, William Edward Wintermeyer, D. J. Caffrey, Duncan Stuart, George P. Bodnar, William Norwood Sparhawk, R. R. Graves
· 1927
- Ralph U. Cotter, C. A. Magoon, Charles Brooks, Charles Faye Sarle, Charles Otis Johnston, Curtis Paul Clausen, Elmer Ottis Wooton, Floyd Franklin Smith, Fred W. Miller, Harvey Leroy Westover, Howard E. Middleton, Irvin Cecil Brown, Irvine Theodore Haig, James Thorp, Lester Henry Reineke, Lyle Thomas Alexander, Millard Peck, Orator Fuller Cook, Ronald Floyd Luxford, Samuel Augustus Jones, V. L. Wildermuth, Walter Chapin Holmes, William Hobson Rowe, William John Nolan, Willis James Nolan, Bernard Frank, Charles W. Culpepper, Clarence Sheldon Slater, Donald Bruce, Edwin Butterworth Mains, Elmer Valentine Walter, Horace Greeley Byers, John Thomas Scanlan, Johnson Thatcher Sarvis, Lorraine Joseph Markwardt, Paul A. Berry, R. R. Graves, Theodore Roosevelt Gardner, Anis Rae Peterson, Kaku Sato, Leroy Moomaw, Paul Axel Clarence Eke, George W. Morgan, John Carl Thysell, M. A. Bell
· 1932