- David M. Alberson, James L. McGuinness, LeRoy Oscar Anderson, Orin A. Hills, Richard Hollis Day, Donald L. Brakensiek, Thomas Bruce Heebink, Victor Leo Stedronsky
· 1963
Set includes revised editions of some issues.
- Edgar John Udine, Edmund Lambert, Edward Mackay Chace, Emil George Boerner, F. L. Duley, Franklin Arthur Coffman, George Emil Gaus, Gerard Dikmans, Harold Robert Hochmuth, John Stuart Pinckney, Joseph Benjamin Shepherd, M. A. Yothers, Mark Hughlin Haller, Robert Hale Nelson, Roland McKee, Russell Rutherford Whitten, United States. Department of Agriculture, Victor Leo Stedronsky, W. A. Douglas, W. G. Bradley, William John Reid, William Solomon Porte, Carroll Clayton Cassil, Charles Scott Shaw, Dean Humboldt Rose, Earl Raymond Franklin, Harry August Schoth, Harry Bruce Walker, Latimer Ludwig Kelly, Paul B. Allen, Rhea Emerson Stitt, Thomas Laffin Baggette, Thompson Elwyn Woodward, William Alexander Noel, Arvid John Johnson, Marion Clawson, Paul Lewis Harding, Vinnie Arah Pease, Waldo Harold Kliever
· 1941
- Albert S. Hunter, Anselm Clyde Griffin, Donald Douglas Durost, Gerald N. Franks, Henry Howard Finnell, Jose Vicente-Chandler, Miron L. Heinselman, Norris W. Gilbert, Oris T. Robertson, Oscar K. Barnes, Ralph Dickieson Jennings, Robert Warren Cooper, Thomas James Army, Walter E. Chapman, William E. Hendrix, William S. Chepil, Charles Scott Shaw, Clifford Scharff Schopmeyer, Donald S. Black, Fernando Abruna, Glen Thomas Barton, Lauren M. Burtch, Neal P. Woodruff, Oliver L. McCaskill, Victor Leo Stedronsky, Warren Durward Hanson, Cuthbert Henry McDowell, Dennis H. Currie, Servando Silva, William H. Davis McGregor
· 1958