- 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
- 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
- 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
- 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