- Arnold L. Nelson, Arvid John Johnson, Bradford Knapp, Charles Ellsworth Gage, Curtis Benton, Cyril Oliver Bratley, D. F. Fisher, E. H. Siegler, Edmund Lambert, Floyd Franklin Smith, Forrest Vern Owen, Frederick James Stevenson, George Arceneaux, George McMillan Darrow, Hazel Katherine Stiebeling, James Herbert Beattie, Loyd William Brannon, Robert Roland Farrar, Van E. Romney, Waldo Lee McAtee, Wayne Melville Bever, William Henry Burrows, William Ogilvie Fraser, William Taylor Miller, United States. Department of Agriculture, Arthur Steele Mason, Charles Frederick Clark, Don Juan Slater, Esther Funnell Phipard, Francis Munger, Harry Humfeld, Howard W. Johnson, I. E. Stokes, Jacob Martin Lutz, Joseph Patrick Quinn, Thomas Laffin Baggette, Victor Rickman Boswell, Wesley Pillsbury Flint, Woodrow Wilson Bailey, John McDowell McCown, Lloyd E. Smith, Talbott Elson Clarke
· 1939
- Edgar John Udine, Edmund Lambert, Edward Mackay Chace, Emil George Boerner, F. L. Duley, Franklin Arthur Coffman, George Emil Gaus, Gerard Dikmans, Harold Robert Hochmuth, John Stuart Pinckney, Joseph Benjamin Shepherd, M. A. Yothers, Mark Hughlin Haller, Robert Hale Nelson, Roland McKee, Russell Rutherford Whitten, United States. Department of Agriculture, Victor Leo Stedronsky, W. A. Douglas, W. G. Bradley, William John Reid, William Solomon Porte, Carroll Clayton Cassil, Charles Scott Shaw, Dean Humboldt Rose, Earl Raymond Franklin, Harry August Schoth, Harry Bruce Walker, Latimer Ludwig Kelly, Paul B. Allen, Rhea Emerson Stitt, Thomas Laffin Baggette, Thompson Elwyn Woodward, William Alexander Noel, Arvid John Johnson, Marion Clawson, Paul Lewis Harding, Vinnie Arah Pease, Waldo Harold Kliever
· 1941
- Edgar John Udine, Edmund Bryan Lambert, Frank Leslie Duley, Joseph Benjamin Shepherd, M. A. Yothers, Robert Hale Nelson, Russell Rutherford Whitten, Victor Leo Stedronsky, William Alvin Douglas, Arvid John Johnson, Carroll Clayton Cassil, Latimer Ludwig Kelly, Paul B. Allen, Thompson Elwyn Woodward, Thomas Laffin Baggette
· 1941
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