Carl Alsberg / Charles Henry Thompson / Edward Gerrard Montgomery / Ernest H. Mathewson / Frank Rabak / George Charles Frederick Humann / Guy N. Collins / H. P. Gould / Harley Harris Bartlett / Herbert H. Bunzel / Homer LeRoy Shantz / I. G. McBeth / James Howard Kempton / Jesse Baker Norton / Lon Adrian Hawkins / Orator Fuller Cook / Roland McKee / United States. Bureau of Plant Industry / Warner Webster Stockberger / F. M. Scales / Otis Fisher Black / Percy Leroy Ricker | 