by Reginald D. Forbes, Alvah Peterson, Arthur Truman Semple, Charles Dwight Marsh, Clarence Luther Forsling, Donald Bruce, Edmund Cecil Shorey, Franklin Post Metcalf, Hugh Curtis McPhee, Irvin Carl Feustel, Joshua John Skinner, Josiah Chase Folsom, Karl S. Quisenberry, Lyle Thomas Alexander, Marinus Westveld, R. W. Leukel, Richard Edwin McArdle, Stuart Bevier Show, Theo. H. Scheffer, Thomas Roy Truax, Walter Carter, Wilbur Clifford Edmundson, William Henry Black, A. B. Clawson, E. I. Kotok, Edwin Alfonso Trowbridge, H. E. Dvorachek, Horace Greeley Byers, K. D. Jacob, K. F. Warner, Lester Henry Reineke, O. N. Eaton, Charles Vinyard Wilson

1931

by 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