- Frank Leslie Duley, Alfred Douglas Edgar, Arthur Frederick Sievers, Claude Kedzie Shedd, Frank W. Tilley, George McMillan Darrow, Harold Everett Tower, Harry L. Garver, Irvin Fay Reed, Leon Sherwood Minckler, Morris Samson Lowman, Myron Francis Babb, O. L. Mimms, Philip Luginbill, Rush Porter Marshall, Tom Dale, Verne Elbert Davison, Walter Whittier Swett, William Phelps Everard, William White, Alma May Waterman, Arthur Glenn Chapman, Elmer Clark Stevenson, George Fordyce Waldo, Harry Harrison Gardner, James Ellsworth Kraus, Jouette Clark Russel, Miriam Birdseye, William John Zaumeyer
· 1951
- A. B. Clawson, Arthur Frederick Sievers, C. H. Batchelder, C. J. King, Chase Going Woodhouse, Frederick Charles Scobey, Glenn Sanborn Smith, Hugh Hackland Darby, Irvin Carl Feustel, Irvin Cecil Brown, James Robert Douglass, John Guice Sutton, John William Strowbridge, Leander Scales Stuart, M. A. Crosby, M. S. Anderson, Milo Nelson Wood, Norma Lenys Pearson, Orville Alva Faris, Robert Claude Wright, Samuel Fortier, William Henry Black, Arthur Appleton Young, David Dewitt Questel, Edwin Alfonso Trowbridge, Eleanor Muriel Kapp, Faith Moors Williams, Horace Greeley Byers, Jacob Allen Clark, Morris Samson Lowman, Ralph Wylie Frey, Thomas Donnelly Rice, Walter M. Peacock, Lawrence Henry James, Thomas Moore Whiteman
· 1933
- 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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