- Lela Evangeline Booher, Robert Van Rensselaer Reynolds, Arlo McGrillis Vance, Arnold Kent Balls, B. L. Wade, Clarence Francis Kelly, Earl W. McComas, Erastus Newton Bates, Frank Shirley Chamberlin, George Haymaker Vansell, Hamilton Paul Traub, Hazel Katherine Stiebeling, Herbert Halden Walkden, James William Park, John Paul Miller, Ralph Corbin Hall, Robert Hibbs Peebles, Roger Ulysses Swingle, Russell Rutherford Whitten, W. A. Douglas, Walter Jay Hall, William Doyle Reed, William Henry Black, United States. Department of Agriculture, Albert Halsey Pierson, Archie Hugh Madden, Burwell Britt Powell, Eva R. Hartzler, Jesse Wilburn Ingram, John Paul Vinzant, Malcolm Ernest Smith, Marian William Hazen, Sadye Frances Adelson, T. Ralph Robinson, Verner Ivan Clark, Elizabeth Margaretta Hewston, Ennis C. Blake, Harold Edwin Stevens, James Edwin Comfort
· 1942
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Arlo McGrillis Vance, Brittain Bragunier Robinson, C. J. Babcock, Charles Alexander Burmeister, Clarence Sheldon Slater, D. F. Fisher, Dwight Moore DeLong, Earl Hazeltine Frothingham, Eloise Blaine Cram, Gustaf Adolph Pearson, Harold Reginald Offord, Harry Lamont Parker, Homer Durant Poore, J. C. Hamlin, James Clyde Munch, Le Roy August Reynoldson, Lee Fred Hawley, Lorraine Joseph Markwardt, Myron Sallee Anderson, R. S. Holmes, Ralph P. Hotis, Rush Porter Marshall, Theodore Alexander Kiesselbach, W. H. Hosterman, Arthur Anderson, Enoch Lloyd Reeves, Glen Edgington, Herman M. Conway, Horace Greeley Byers, James Silver, Walter Raymond Humphries, William Doyle Reed, Albert Perry Brodell, John Holmes Martin, M. E. Phillips· 1931
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Arlo McGrillis Vance, Carlos Elmer Campbell, Clarence Elbert Clement, Claud Franklin Clayton, David Lawrence Wickens, Edwin Butterworth Mains, Ernest Hayden Bailey, Erval Jackson Newcomer, Frederick William Metzger, George Frederick Sprague, John Shaw Boyce, Lenthall Wyman, Margaret Smith Furry, Moses Naphtali Levine, Neil William Johnson, O. N. Eaton, R. W. Leukel, Ralph Edwin Beckett, Robert Pilson Albert Johnson, Samuel Palkin, Stuart Bevier Show, Thomas Randall Carson Wilson, Thompson Elwyn Woodward, Wilbur Tibbils Pentzer, Willard Van Orsdel King, Dudley Horace Grant, James Bernard McNulty, James Warren Hubbard, Jesse Burdette Bain, M. A. Yothers, Mary L. Martini, Melvin Ira Bradner, Ralph Ulysses Cotter, William Durrett Nicholls, William Schlei Cook, F. M. Grant· 1931