- Charles A. Fort, Charles Chase Hill, David Francis Costello, David Irving Blumenstock, Doys Andrew Shorb, Elmer R. Roth, Ethelbert Lee Langsford, Everett Elmer Wehr, Frank M. Eaton, Horace Preston Lanchester, Irvin Carl Feustel, Leander D. Howell, Lucy Maclay Alexander, Lyle Thomas Alexander, Mark Hughlin Haller, Milton Henry Fohrman, Robert Edgar Worthington, Roy Hyer Canfield, Stafford Coleman Happ, Thomas Randall Carson Wilson, United States. Bureau of Plant Industry, Vernon Webster Johnson, William Gustavus Wahlenberg, Bailey Sleeth, Ben Hur Thibodeaux, Gordon Rittenhouse, Horace Greeley Byers, John Stuart Pinckney, L. V. Wilcox, Nancy Griswold Clark, Nelson McKaig, Paul Lewis Harding, R. R. Graves, Raymond Price, Sidney Henderson, Smith Winford Greene, Edgar John Udine, Gilbert Colfax Dobson, Glen Edgington, Hiram Richard Reed, James Hayes Marshall
· 1940
- Arthur Henry Joel, Charles Calvert Smoot, Charles Knesal Cooperrider, Clarence Sheldon Slater, Cyril Oliver Bratley, Eugenia Cuvillier, George Henry Hepting, George Luther Schnur, George W. Barber, George Wallace Musgrave, Harold Blaisdell Shepard, Herbert George Barott, James Stewart Wiant, James William Park, Lawrence Zeleny, Lewis Bertie Olmstead, Margaret Blanche Hays, Norman Julian Wall, Paul Lewis Harding, R. L. Piemeisel, R. W. Leukel, Stephen Harold Hastings, Stuart Bevier Show, William Henry Black, Barnard Andrew Hendricks, Dan Hansen, David Augustus Coleman, E. I. Kotok, Edwin Alfonso Trowbridge, F. F. Dicke, Francis Raymond Lawson, George Grant Hedgcock, Jacob Martin Lutz, Oscar Roland Mathews, R. S. Holmes, Ralph Wylie Frey, Robert Arthur Norton, J. I. Hardy, Dean Humboldt Rose, Horace Greeley Byers
· 1937
- Alfred Paul Dachnowski-Stokes, C. C. Plummer, Charles Roy Adair, Fisk Gerhardt, George Jacob Hough, H. S. Haller, Hardy Lomax Shirley, Irvine Theodore Haig, Jasper E. Pallesen, Kenneth Thurman Williams, Leander D. Howell, Myron Francis Babb, Nelson McKaig, O. N. Eaton, Paul A. Woke, Paul Lewis Harding, Philip B. Dowden, Preston Richards, Raymond Carl Rietz, Robert Claude Wright, Robert Leslie Shotwell, Samuel Ebb Crumb, W. P. Green, Winn Frederick Finner, Boyce D. Ezell, C. J. Babcock, H. H. Laude, Hubert William Lakin, John Robinson Winston, Kenneth Pickett Davis, Lewis Alexander Hurst, M. McPhail, Paul M. Eide, Philip Lindsey Gile, Ronald Lester Mighell, William Virgil Hukill, Alfred Eric Bonn, D. F. Fisher, Dean Humboldt Rose, F. M. Grant, Horace Greeley Byers, J. W. Monk, Robert H. Weidman, Zera Calvin Foster
· 1941
- Aaron G. Nelson, D. F. Fisher, Albert Oliver Rhoad, Alonzo Clayton Davis, Archie Hugh Madden, Colburn Charles Fifield, D. E. Fox, Dwight David Smith, Ernst Artschwager, George W. Barber, Gustav A. Wiebe, Harold Lamont Borst, L. H. Patch, L. Jay Atkinson, Leander D. Howell, Louis Jay Ducoff, Michael H. Langford, Norma Lenys Pearson, Paul Bruce Marsh, Paul Lewis Harding, Perley Spaulding, W. B. Cartwright, Walter Whittier Swett, Wilbur Tibbils Pentzer, William Henry Black, A. G. McCall, Charles Vinyard Wilson, Clyde Eugene Asbury, Frank Shirley Chamberlin, John W. Klein, Joseph Conrad Chamberlin, Merle T. Jenkins, Philip Russell Cowan, R. B. Carr, R. G. Shands, R. T. Everly, Forrest G. Bell, James Robert Douglass, Lucille Reinbach-Welch, W. R. Barger
· 1946
- Alice Linna Allen Bailey Nightingale, Charles Abel Bennett, Charles Brooks, Charles William Mann, Claude Hope, Dean Humboldt Rose, Dow Dewey Porter, Eloise Blaine Cram, Francis Leo Gerdes, Frederick William Metzger, George W. Barber, Harry Nelson Vinall, Henry Miner Eakin, Irvin Cecil Brown, Katherine Melvina Downey, Norman Julian Wall, Paul Lewis Harding, R. W. Leukel, Robert H. Weidman, Stephen Harold Hastings, Thompson Elwyn Woodward, Verne Lester Harper, William Jeter Phillips, Chalmers Jackson King, Charles Lincoln Powell, Cyril Oliver Bratley, E. A. Gorman, Glen Blaine Ramsey, Horace Greeley Byers, J. C. Stephens, Lenthall Wyman, Ralph P. Hotis, Warren W. Maines, William Cecil Cooper, John Holmes Martin, Lacy Porter McColloch, Orlan Parker, R. R. Graves
· 1936
- 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