- Charles Ford Langworthy, B. R. Coad, C. J. Babcock, Cecil Calvert Thomas, Charles Dwight Marsh, Clyde Ray Chambers, Don Divance Lescohier, Ellis Lore Kirkpatrick, Frank Barnes Herbert, Frederick David Richey, George Oury Gatlin, George Ray Boyd, Harry Edward Roethe, Horace Mann Woolman, Howard Ross Tolley, James Allen Nelson, Jason Edward Barr, Jesse Lee Webb, Josiah Chase Folsom, Norman Eugene McIndoo, Oliver I. Snapp, Walter Wesley McLaughlin, William Walter Yothers, Richard Ambrose Hart, A. B. Clawson, Alice Ranney Thompson Merrill, Arnold Parker Sturtevant, Arthur Charles Mason, Arthur Frederick Sievers, Charles Harold Alden, Elmer Johnson, Harry Baker Humphrey, Helen W. Atwater, John Robinson Winston, Roscoe Ward Wells, Walter Raymond Humphries, Bruce Lineburg, Guy L. McNeil, Ilena M. Bailey
· 1928
- 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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