- R. C. Brown, Albert Ronald Merz, Charles Walter Collins, Clarence Luther Forsling, David Breese Jones, F. E. Staebner, Frank Heidtman Lathrop, George Arceneaux, George Thomas Ratliffe, Glenn Arthur Cumings, Godfrey Leonard Alvin Ruehle, Hastings Newcomb Bartley, Jacquelin Smith Cooley, Joseph Benjamin Kuska, L. B. Scott, Lyster Hoxie Dewey, Mayne Reid Coe, Owen Edward Williams, Royal Joyslin Haskell, Stephen Harold Hastings, Thompson Elwyn Woodward, Walter Tennyson Swingle, Wilbur Clifford Edmundson, United States. Department of Agriculture, Beyer Aune, Charles MacFarlane Brewer, Clifford E. Hood, I. E. Stokes, Irvin Milburn Atkins, Jesse Harold Crenshaw, Lawrence Clayton McAlister, R. W. Leukel, Sumner Augustus Hall, T. Ralph Robinson, William Adams Dayton, Edward Morris Savage, Emil George Boerner, Ralph Brownson Bisland
· 1932
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