by Theodore Macklin, Waldo Ernest Grimes, John Harrison Kolb

1927

by Bruce Lester Warwick, Edmond Joseph Delwiche, Edwin Broun Fred, George Wannamaker Keitt, Gordon Thayer Nightingale, Harley Frost Wilson, Hugo Henry Sommer, John Harrison Kolb, Lewis Ralph Jones, Ray Harland Roberts

1925

by Benjamin Horace Hibbard, Edmond Joseph Delwiche, Frank Barron Morrison, Fred G. Wilson, Isaac Walker Rupel, John Harrison Kolb, Theodore Macklin, University of Wisconsin. Agricultural Experiment Station

1928