by A. D. McNair, Alexander Wetmore, Arlow Burdette Stout, C. J. Babcock, Duncan Dunning, Franklin Elmer Allison, George McMillan Darrow, George Pelham Walton, Horace Harold Willis, John Holmes Martin, John Robinson Winston, Joseph Heilman Shollenberger, Julius Valentine Hofmann, Ralph Waldo Smith, Raymond Secord Washburn, Robert Lesley Davis, Robert Percy Brandt, United States. Office of Experiment Stations, Warren Clemmer Funk, Wells Aleck Hutchins, William Henry Waggaman, William Middleton, William Stuart Moir, Charles Frederick Clark, Clyde Evert Leighty, Henry Wyatt Easterwood, Jacob Allen Clark, John Jay Bowman, Joseph M. Braham, Lawrence Root Waldron, Walter Keith Marshall, David Augustus Coleman, James Edward McMurtrey, Thomas B. Turley, William Walter Yothers

1928

by Edward Parrott

1918

by Edward Foss

1864

by Edgar Vermont Collins, Harold De Mott Hughes, Hazel Kyrk, Irving E. Melhus, John Frederick Thaden, Joseph Edward Guthrie, Lewis Wilson Erdman, William Henry Stevenson, A. B. Caine, F. S. Wilkins, L. W. Forman, Walter Beno Bollen, Percy Edgar Brown

1925