- Charles Adolph Weigel, Charles John Stauber, D. C. Parman, D. W. Jones, David Griffiths, Don Inskeep Skidmore, Elmer Ottis Wooton, Erastus Newton Bates, Ernst H. Wiecking, James A. Holden, John Chambers McDowell, John Clay Overpeck, Kelsey Beeler Gardner, Lloyd Stanley Tenny, Lucia McCulloch, Madge Janet Reese, Ora Stanley Fisher, Orator Fuller Cook, Raphael Zon, United States. Department of Agriculture, Ward Shepard, William Alfred Schoenfeld, William Edward Wintermeyer, D. J. Caffrey, Duncan Stuart, George P. Bodnar, William Norwood Sparhawk, R. R. Graves
· 1927
- Alfred Paul Dachnowski-Stokes, Arnold Orlando Benson, Bruce Berger Derrick, Curtis May, Curtis Paul Clausen, Erastus Newton Bates, Erval Jackson Newcomer, George Arceneaux, George McMillan Darrow, George Whitfield Stiles, Glen Blaine Ramsey, Hastings Newcomb Bartley, Homer Charles McNamara, James Robert Dawson, John Clay Overpeck, Joseph Martin Mehl, Morris Cotgrave Betts, Neil E. Stevens, Oliver I. Snapp, Perez Simmons, Roland McKee, Samuel Benton Nuckols, United States. Department of Agriculture, Victor Bigelow Bonney, Walter M. Peacock, William Albert Hartman, Byron Curtis Brunstetter, Dalton Ray Hooton, G. F. Gravatt, George Fordyce Waldo, George P. Bodnar, Harry August Schoth, Harry Avalon Elcock, James Randolph Thomson, John Donald Black, L. B. Scott, M. A. Yothers, Manly Alexander Raymond Kelley, Paul A. Clifford, Richard Thomas Gibbens, William Doyle Reed, Dow Dewey Porter, E. A. McGregor, Edward James Stirniman, Henry Albert Lepper, James Louis Stephens
· 1931
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