- Alfred Douglas Edgar, Alpha Cornelius Johnson, Charles Brooks, D. E. Fox, Dwight Moore DeLong, Ernest Wilson Grove, George Whitfield Delux Hamlett, Horace Greeley Byers, Irvin Cecil Brown, Jacob Martin Lutz, James Edward McMurtrey, James Merrill Wallace, James Stewart Wiant, John Carl Thysell, Knute Bjorka, Leander D. Howell, Ralph Edwin Beckett, Ross Calvin Thompson, Stephen Harold Hastings, T. D. Jarrell, Theo. H. Scheffer, Thompson Elwyn Woodward, William Henry Black, Albert Marion Murphy, George Grover Becker, James McKenzie Hankins, James Richard Quesenberry, Joseph Benjamin Shepherd, Lacy Porter McColloch, Leonard Joseph Watson, Robert S. Stitt, Samuel Benton Nuckols, Alfred Leroy Baker, Edward Neal Duncan, Fletcher Pearre Veitch, Lionel Harris, Lon Adrian Hawkins
· 1939
- Benjamin Schwartz, Beyer Aune, Charles Allen Clark, Charles Edwin Kellogg, Charles W. Culpepper, Clarence Sheldon Slater, Clifford Curtis Taylor, Elmer W. Knight, George Fordyce Waldo, George McMillan Darrow, Jacob Allen Clark, James William Park, Loren George Polhamus, Lytton W. Boyle, Perry Kenton Norris, Ralph Edwin Beckett, Ralph P. Hotis, Robert Claude Wright, Theo. H. Scheffer, Thompson Elwyn Woodward, William Alfonso Baker, William Orrin Robinson, Burton Bernard Bayles, Clarence Cottam, Glen Edgington, Horace Greeley Byers, Hubert Hill Moon, J. I. Lauritzen, James Kenneth Ableiter, Joseph Addison Elder, Joseph Everett Alicata, L. G. Jones, Lewis Alexander Hurst, R. R. Graves, Raymond R. Pailthorp, Robert S. Stitt, Albert Osenbrug, Harlan H. Hill, Thomas Moore Whiteman
· 1935
- Albert Ronald Merz, Auton William Skuderna, B. L. Wade, Bess Viemont Morrison, Chalmers Jackson King, Charles Frederick Clark, Charles W. Culpepper, Clark Frederick Clark, David A. Savage, Elmer Valentine Walter, Ernest Muchmore Mervine, Fred Corry Bishopp, George Washington Craddock, Helen Nebeker Hann, Joseph Stuart Caldwell, Joshua John Skinner, Leo Anthony Isaac, Loyd William Brannon, Oscar Roland Mathews, Paul A. Berry, Rufus King Helphenstine, Samuel Newton Dicken, United States. Department of Agriculture, Victor Rickman Boswell, Wilbur Clifford Edmundson, William Daniel Smith, Hazel Katherine Stiebeling, Arthur Otto Alben, Carroll Newton Smith, Frederick James Stevenson, Hubert Hill Moon, James Herbert Beattie, Lee Seaton, Lindsey Andrew Brown, Margaret Blanche Hays, Ralph Edwin Beckett, Stanley Ward McBirney, Adonis A. Mathewson, Earl Donald Fowler, John McDowell McCown, Orlan Parker
· 1939
- Arthur Henry Senner, Auton William Skuderna, Benjamin Ralph Stauber, Charles Brooks, Clarence Elbert Clement, Curtis Paul Clausen, Edmund Lambert, Edward E. Clayton, Erval Jackson Newcomer, George McMillan Darrow, Glenn Arthur Cumings, Glenn Marsh Smith, James Herbert Beattie, James Robert Dawson, James Warren Hubbard, L. H. Patch, M. McPhail, Marion Bertice McKay, Ralph Edwin Beckett, Rosemary Laughlin Marsh, Rosemary Loughlin, Theodore Bergen Manny, Victor Rickman Boswell, William Doyle Reed, United States. Department of Agriculture, Archie Glenn Van Horn, Charles Evans Cormany, Chester Ihner Bliss, Erskine McFarlane Livingstone, Eugene Taylor Batten, Frederick Wulling Herbert, George Fordyce Waldo, John Gordon Gaines, Austin W. Morrill (Jr.), Lewis Alexander Hurst
· 1932
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David Egbert Fox, Horace Greeley Byers, Irvin Cecil Brown, Jacob Martin Lutz, Leander D. Howell, Ralph Edwin Beckett, Temple De Rochbrune Jarrell, Theo. H. Scheffer, William Henry Black, Alfred Leroy Baker, Edward Neal Duncan, Fletcher Pearre Veitch, Leonard Joseph Watson, James McKenzie Hankins, James Richard Quesenberry, Robert S. Stitt· 1938