- Thomas S. Buchanan, Constantin Constantinovich Nikiforoff, Dwight McBryde Simpson, Dwight Moore DeLong, Frank M. Eaton, G. J. Haeussler, G. R. Free, George Wright Hoffman, Gustav A. Wiebe, Harold Andrus Jaynes, Harry Ardell Allard, Henry Hopp, J. I. Lauritzen, James Robert Dawson, Joseph Stuart Caldwell, Kenneth Thurman Williams, Lawrence Zeleny, Loyd L. Stitt, Marshall Weddell Stone, Raymond Peter Christensen, Robert Merton Walsh, Ruth Elmquist Rogers, Theodore Roosevelt Gardner, Thomas Charles Chadwick, Wilbur Tibbils Pentzer, Caroline L. Adams, Charles A. Fort, David Victor Kopland, E. K. Bynum, George Henry Englerth, Helen Garrison Wheeler, James Stewart Wiant, Lawrence Bemis Parker, Morris Harvey Neustadt, Philip Russell Cowan, R. R. Whetstone, Ronald Lester Mighell, Roy Drummond McCallum, Samuel Palkin, Wightman Wells Garner, G. M. Stone, Harry Humfeld, John Henry MacGillivray, Lucille Reinbach-Welch, Miles Stratford Mayhugh, R. R. Graves, R. T. Balch
· 1941
- 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