- Arthur Vance Swarthout, Charles Sidney Leete, David Griffiths, David Segrid Olson, Elmer Lash, Ernst H. Wiecking, Frank Getz Ashbrook, Frank Heidtman Lathrop, Frederick Charles Lincoln, George Emil Heck, George Herbert Coons, H. F. Willard, Harold Coleman Hallock, John Chambers McDowell, Justus Watson Folsom, M. A. Yothers, R. W. Leukel, Ralph Henry Elsworth, Reginald D. Forbes, United States. Department of Agriculture, Walter Cochran Davis, Wiley Croom Smith, William Gustavus Wahlenberg, Charles M. Harris, Dewey Stewart, Donald Bruce, Fletcher Pearre Veitch, Floyd Frank Bondy, Ira Burton Lanphier, Karl Burchard Hanson, Theodore Lemuel Bissell, William Melvin Mohler, Finley George Larmer
· 1929
- H. L. Person, Albert Ronald Merz, Burt Walter Heywang, Charles W. Culpepper, Clarence Elbert Clement, Colin Alexander Taylor, Edward Dougall Gordon, Edwin Richard Kalmbach, Floyd Franklin Smith, Glenn Kenton Rule, H. F. Willard, Harold Hall McKinney, Irving Wesley Dix, Ivan Claude Jagger, James Vernon Morrow, John Clifford Elmore, John Robbins Mohler, Lee Milo Hutchins, Marinus Westveld, Matthew James Culley, May Thacher Cooke, Randall Latta, Robert Claude Wright, Samuel Benton Nuckols, Stuart Bevier Show, United States. Department of Agriculture, Maurice S. Shahan, Arthur Charles Mason, Charles Cloyes Fletcher, Dudley Smith, Eddie Walter Bodine, Gilbert Weaver Scott, Hubert Hill Moon, Joe Roudolph Furr, John Robert Magness, Leonard Gordon Utter, Wilbur Magruder Hurst, Halbert Houston Thornberry
· 1937
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H. F. Willard, Arthur F. Swanson, Arthur Frederick Sievers, C. J. Babcock, Carl S. Scofield, Charles Dwight Marsh, Curtis Paul Clausen, David Augustus Coleman, David Griffiths, E. A. McGregor, Edith Hawley, Edward Mackay Chace, Edwin Richard Kalmbach, Erval Jackson Newcomer, Hugo F. Stoneberg, J. E. Patterson, James Shoffner Hathcock, John William Strowbridge, Raymond Louis Nougaret, Vernon Bailey, A. B. Clawson, Benton E. Rothgeb, Calvin Grant Church, Edward O. Orpet, James A. Holden, M. A. Yothers, Macy Harvey Lapham, G. C. Roe· 1927
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Benjamin Schwartz, Charlotte Chatfield, Chester Otis Reed, E. R. Van Leeuwen, E. W. Sheets, Eloise Blaine Cram, George McMonies Hunt, Glen Blaine Ramsey, James William Park, John Brown Cuno, John Harold Lister, Joseph Lyonel King, Karl S. Quisenberry, Liberty Hyde Bailey, Lorin Harvey Bailey, Marinus Westveld, Neil E. Stevens, Perry Eugene Howard, Robert Montgomery Gehl, Roland McKee, Sherlock Melvin Dietz, Theodore Bergen Manny, Vera Katherine Charles, Wilbur Magruder Hurst, William Orrin Robinson, Charles Ranger Enlow, Cortes Gilbert Randell, Georgian Adams, Jacob Allen Clark, James Keever Holloway, Lysle Douglas Leach, Marion Imes, Robert Henry Black, William Ensley Jackson, Willard Hull Wright· 1930