- Albert Rudolf Leding, Alexander Campbell Martin, Arnon Lewis Mehring, Arthur Henry Senner, Arthur T. Sweet, Auton William Skuderna, Benjamin Ralph Stauber, C. C. Plummer, C. H. Hadley, Chalmers Jackson King, Curtis May, Curtis Paul Clausen, David A. Savage, David Griffiths, Ernest Victor Abbott, Floyd Franklin Smith, Frederick Charles Lincoln, George Arceneaux, Glenn Gardner Hahn, Harold F. Scholz, Harold Glenn Meginnis, Harold Hall McKinney, Harry Baker Humphrey, J. Clark Salyer, James Fitton Couch, James Herbert Beattie, Jenkin William Jones, John Morrison Cooper, John Robert Parker, Kurt Walter Franke, Lewis Alexander Hurst, Mayne Reid Coe, Orator Fuller Cook, Paul George Russell, Paul Mehl, Paul William Miller, R. A. Blanchard, R. T. Balch, Ralph P. Hotis, Robert J. Sim, Robert Max Merrill, Theodore Bergen Manny, United States. Division of Silvics, Walter Ernest Fleming, Wilbur Clifford Edmundson, Wilbur Magruder Hurst, Wilfred Wickes Ballard, William Middleton, United States. Department of Agriculture, Asa Young Willis, Avis Jenkin Peterson, Claude Hope, Frederick William Metzger, I. E. Stokes, Ira Myron Hawley, J. I. Lauritzen, James Robert McCalmont, John Adam Stoehr, John Walter Taylor, Ralph Brownson Bisland, Victor Rickman Boswell, Walter Raymond Humphries, Wayne Crocker Nason, William Ernest Stone, Charles Conrad Krumbhaar, E. E. Hall, Max Raymond Osburn, Roland McKee
· 1933
- David Leroy Yarnell, Fletcher Pearre Veitch, Frederick William Metzger, L. J. Palmer, O. K. Hedden, Walter Ernest Fleming, William Bonar Bell, Edward Alexander Preble
· 1934
General survey of the industry including characteristics, range and herd management.
- Alice Linna Allen Bailey Nightingale, Charles Abel Bennett, Charles Brooks, Charles William Mann, Claude Hope, Dean Humboldt Rose, Dow Dewey Porter, Eloise Blaine Cram, Francis Leo Gerdes, Frederick William Metzger, George W. Barber, Harry Nelson Vinall, Henry Miner Eakin, Irvin Cecil Brown, Katherine Melvina Downey, Norman Julian Wall, Paul Lewis Harding, R. W. Leukel, Robert H. Weidman, Stephen Harold Hastings, Thompson Elwyn Woodward, Verne Lester Harper, William Jeter Phillips, Chalmers Jackson King, Charles Lincoln Powell, Cyril Oliver Bratley, E. A. Gorman, Glen Blaine Ramsey, Horace Greeley Byers, J. C. Stephens, Lenthall Wyman, Ralph P. Hotis, Warren W. Maines, William Cecil Cooper, John Holmes Martin, Lacy Porter McColloch, Orlan Parker, R. R. Graves
· 1936
- Alexander Campbell Martin, Arthur Henry Senner, C. C. Plummer, C. H. Hadley, Chalmers Jackson King, Curtis Paul Clausen, David A. Savage, Ernest Victor Abbott, Frederick Charles Lincoln, Glenn Gardner Hahn, Harold Francis Scholz, Harold Glenn Meginnis, J. Clark Salyer, James Herbert Beattie, Jenkin William Jones, Mayne Reid Coe, Paul William Miller, Ralph P. Hotis, Robert J. Sim, United States. Department of Agriculture, Walter Ernest Fleming, Wilbur Clifford Edmundson, Wilbur Magruder Hurst, Claude Hope, Frederick William Metzger, Ira Myron Hawley, James Robert McCalmont, John Walter Taylor, Victor Rickman Boswell, Walter Raymond Humphries, William Ernest Stone, E. E. Hall, Max Raymond Osburn, Roland McKee
· 1934