- D. J. Caffrey, E. H. Siegler, Erastus Newton Bates, Frank Hurlbut Chittenden, Freeman Earl Parsons, H. P. Gould, Howard Ross Tolley, Jacob Allen Clark, Le Roy August Reynoldson, Martin Reese Cooper, Robert Henry Black, Roy Elliott Campbell, Russell Arthur Oakley, Thomas Arrington Huntington Miller, United States. Bureau of Plant Industry, William Allen Orton, William Jasper Spillman, Charles Roy Haller, Fred Campbell Meier, Harvey Leroy Westover
· 1922
- A. C. Morgan, Alma May Waterman, Byron Hunter, D. J. Caffrey, Edward Cary Parker, Elvin Charles Stakman, George Andrews Mitchell, George I. Reeves, George Ray Boyd, Henry Asmus, James Silver, Jesse Wilburn Ingram, John Chambers McDowell, John Mott Buck, John William Roberts, Maude Campbell, Morley Allan Jull, Murrell Williams Talbot, Robert Henry Black, Wendell Holmes Tisdale, Wilbur Reed Mattoon, William Henry Black, Alfred R. Lee, Emil George Boerner, F. E. Staebner, Forrest Ellwood Kempton, Frank Shirley Chamberlin, John Clymer Dunegan, John Oscar Williams, Leon Howard Worthley, Ralph Dickieson Jennings, V. F. Tapke, Lynn D. Hutton
· 1929
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