- Carl S. Scofield, Archibald Dixon Shamel, David A. Savage, David Leroy Yarnell, E. C. Tullis, Earl Dewey Mallison, Frederic Gordon Renner, Frederick Lovejoy Wellman, Hazel Edith Munsell, Horace Greeley Byers, Howard Barrett Richardson, Irvin Carl Feustel, Johnson Thatcher Sarvis, Joseph Heilman Shollenberger, Mason August Hein, Maxon Young Pillow, Myron Sallee Anderson, Norman Julian Wall, Percy Hoke Royster, T. D. Jarrell, Theodore Comstock Scheffer, Thornton Taft Munger, Walter Huber Meyer, William Henry Black, Alonzo Charles Cook, Carl Stone Pomeroy, Charles Lloyd Moon, E. A. Gorman, Grace Margaret DeVaney, James McKenzie Hankins, James Richard Quesenberry, John Carl Thysell, Ronald Floyd Luxford, Thomas L. W. Bailey, Alfred Leroy Baker, Carl Marcus Conrad, Elmer W. Knight, Fletcher Pearre Veitch, Mary Hanford Kennedy, Ralph Emerson Caryl, William Virgil Hukill
· 1937
- Charles F. Henderson, Alvin George Anderson, Arthur Frederick Sievers, Brittain Bragunier Robinson, Charles Cloyes Fletcher, Charles W. Culpepper, Clarence Francis Kelly, Claude Kedzie Shedd, Edward Mackay Chace, George Lloyd Hayes, George McMillan Darrow, Harold Edwin Stevens, Ivan Claude Jagger, James Okley Grandstaff, Mark Hughlin Haller, O. K. Hedden, Paul Jones Chapman, R. W. Leukel, Ralph W. Phillips, Robert Wallace Gerdel, Thornton Taft Munger, United States. Department of Agriculture, Walter Ernest Fleming, William Solomon Porte, Joy Harold Clarke, Albert Ronald Merz, Archie Davilla Hess, Donald Navarre Matthews, Emory Dwight Burgess, Frederick Lovejoy Wellman, Harry Willard Von Loesecke, Hubert Hill Moon, Jacob Martin Lutz, Jay Brownlee Davidson, Ole Anker Nelson, Ralph Boutelle Piper, Robert Max Merrill, Walter Louis Hodde, Bailey Edgar Brown, Earl Dewey Mallison, Edgar Vermont Collins, John Laurence Heid, Warren W. Maines
· 1941
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