- Edgar John Udine, Edmund Lambert, Edward Mackay Chace, Emil George Boerner, F. L. Duley, Franklin Arthur Coffman, George Emil Gaus, Gerard Dikmans, Harold Robert Hochmuth, John Stuart Pinckney, Joseph Benjamin Shepherd, M. A. Yothers, Mark Hughlin Haller, Robert Hale Nelson, Roland McKee, Russell Rutherford Whitten, United States. Department of Agriculture, Victor Leo Stedronsky, W. A. Douglas, W. G. Bradley, William John Reid, William Solomon Porte, Carroll Clayton Cassil, Charles Scott Shaw, Dean Humboldt Rose, Earl Raymond Franklin, Harry August Schoth, Harry Bruce Walker, Latimer Ludwig Kelly, Paul B. Allen, Rhea Emerson Stitt, Thomas Laffin Baggette, Thompson Elwyn Woodward, William Alexander Noel, Arvid John Johnson, Marion Clawson, Paul Lewis Harding, Vinnie Arah Pease, Waldo Harold Kliever
· 1941
- N. R. Ellis, Charles William Rees, Edwin Richard Kalmbach, Enoch Wesley Nelson, Fenner Satterthwaite Stickney, Foster Hendrickson Benjamin, George Bishop Sudworth, Harvey Leroy Westover, James William Park, Joseph Stuart Caldwell, Leander D. Howell, Lloyd Ancil Spindler, M. A. Yothers, Raymond Frank Taylor, Robert Claude Wright, Robert Ellsworth Getty, Robert Pilson Albert Johnson, Thomas Ray Stanton, Tyler Frazier Akers, United States. Bureau of Agricultural Economics, Walter Huber Meyer, Wightman Wells Garner, William Henry Black, William Stuart, Edwin Harrison Milstead, Franklin Arthur Coffman, Harry August Schoth, Jay Laurence Lush, John Henry Zeller, Marsden Robert Brundage, Walter M. Peacock, Arthur Truman Semple, V. F. Tapke
· 1935