- Thomas S. Buchanan, Constantin Constantinovich Nikiforoff, Dwight McBryde Simpson, Dwight Moore DeLong, Frank M. Eaton, G. J. Haeussler, G. R. Free, George Wright Hoffman, Gustav A. Wiebe, Harold Andrus Jaynes, Harry Ardell Allard, Henry Hopp, J. I. Lauritzen, James Robert Dawson, Joseph Stuart Caldwell, Kenneth Thurman Williams, Lawrence Zeleny, Loyd L. Stitt, Marshall Weddell Stone, Raymond Peter Christensen, Robert Merton Walsh, Ruth Elmquist Rogers, Theodore Roosevelt Gardner, Thomas Charles Chadwick, Wilbur Tibbils Pentzer, Caroline L. Adams, Charles A. Fort, David Victor Kopland, E. K. Bynum, George Henry Englerth, Helen Garrison Wheeler, James Stewart Wiant, Lawrence Bemis Parker, Morris Harvey Neustadt, Philip Russell Cowan, R. R. Whetstone, Ronald Lester Mighell, Roy Drummond McCallum, Samuel Palkin, Wightman Wells Garner, G. M. Stone, Harry Humfeld, John Henry MacGillivray, Lucille Reinbach-Welch, Miles Stratford Mayhugh, R. R. Graves, R. T. Balch
· 1941
- A. D. McNair, Curtis Paul Clausen, Dalton Giles Miller, Dan Hansen, Dean Humboldt Rose, Duncan Dunning, Edward Florince McCarthy, Erasmus Manford Nighbert, Erval Jackson Newcomer, Eubanks Carsner, Frederick Vernon Rand, Harold Andrus Jaynes, James Robert Dawson, L. P. Rockwood, Ned Royce Ellis, Oris Vernon Wells, Paul Oman, Perez Simmons, Philip Lindsey Gile, R. D. Garver, Stephen Harold Hastings, William Albert Hartman, Arthur Edgerton Seamans, Edward Gantt Noble, George Wilburn Ellington, J. W. Connelly, Jacob Martin Lutz, Lester Henry Reineke, Lillian Claire Cash, Max Moore Reeher, Philip W. Manson, R. R. Graves, Raymond Herbert Miller, Roland McKee, Roscoe Harrison Carter, Archie Glenn Van Horn, David Victor Kopland, Theodore Roosevelt Gardner
· 1933
- Alfred Leroy Baker, Benton Mehrling Stahl, Charles William Loomer, Claude Kedzie Shedd, Donald Eisenbrey Church, Edward Pendleton Carter, Elsa Orent-Keiles, Fenner Satterthwaite Stickney, Frank Custer Edminster, Harry Curtis Young, Hazel Marie Fletcher, Herbert Halden Walkden, James Robert Dawson, Joseph Bailey Edmond, Leo E. Holman, M. A. Yothers, Marshall Tracy Deonier, Matthew Drosdoff, Myron Francis Babb, Ralph Dickieson Jennings, Ralph Leroy Parshall, Robert Douglass McCulley, Roy Wesley Nixon, Tom Part Cassidy, W. P. Baird, United States. Department of Agriculture, Arnold M. Hansen, David Victor Kopland, Dwight Fletcher Barnes, Frank Waldemar Carlson, George Yankush Young, James E. Kraus, Maurice E. Dahmus, Vernon Webster Johnson, Walter S. Atkinson, William Henry Black, Arthur Clifton McIntyre, Mary Ellen Duensing, Perez Simmons, Roy Magruder
· 1950
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No image available
No image available
R. D. Garver, A. D. McNair, Curtis Paul Clausen, Dalton Giles Miller, Dan Hansen, Dean Humboldt Rose, Duncan Dunning, Edward Florince McCarthy, Erasmus Manford Nighbert, Erval Jackson Newcomer, Eubanks Carsner, Frederick Vernon Rand, Harold Andrus Jaynes, James Robert Dawson, L. P. Rockwood, Ned Royce Ellis, Oris Vernon Wells, Paul Oman, Perez Simmons, Philip Lindsey Gile, Raiford Ashley Roberts, Stephen Harold Hastings, William Albert Hartman, Arthur Edgerton Seamans, Edward Gantt Noble, George Wilburn Ellington, J. W. Connelly, Jacob Martin Lutz, Lester Henry Reineke, Lillian Claire Cash, Max Moore Reeher, Philip W. Manson, R. H. Carter, Raymond Herbert Miller, Roland McKee, Archie Glenn Van Horn, David Victor Kopland, Theodore Roosevelt Gardner· 1933