- Robert Alexander Gardner, Anna Dorothy Bergner, Annie May Hurd-Karrer, Carroll Newton Smith, Cecil Herbert Wadleigh, Cornelius Herman Muller, Edward Maris Harvey, Ernst Artschwager, Ewert Åberg, George Leonard Rygg, Hamilton Paul Traub, Harris Miller Benedict, Herman Elliot Hayward, Irvin Milburn Atkins, James Benford Pope, Joseph Benjamin Shepherd, L. Jay Atkinson, Leander D. Howell, Louis C. Erickson, Otis A. Pope, Ralph Hoagland, Ralph W. Phillips, Walter Theodore Federer, William Henry Black, William Horace Ross, Ralph G. Schott, Byron Lester Southwell, Elbert Monroe Long, Gustav A. Wiebe, Hugh Gilbert Gauch, Jacob Osborn Ware, Jeanette Robinson, John W. Klein, Moses McWillie Cole, Paul F. Smith, Reynold George Dahms, Thompson Elwyn Woodward, Wade Phillips Young, Carl Gustaf Melin, Damon Alvin Spencer, Harry Kydd Gouck, Oscar Conrad Magistad, Rachel Uhvits
· 1946
- Arnold Kent Balls, Earl W. McComas, Erastus Newton Bates, Hamilton Paul Traub, Jacob Allen Clark, Mark Hughlin Haller, Ralph Corbin Hall, Walter Jay Hall, William Alvin Douglas, William Doyle Reed, Harold Edwin Stevens, James Edwin Comfort, Jesse Wilburn Ingram, John Paul Vinzant, Karl Spangler Quisenberry, Marian William Hazen, T. Ralph Robinson
· 1941
- 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