The Sugar-beet Thrips by Herbert Sinclair Fairbank, Charles Dwight Marsh, John Chambers McDowell, Thornton Taft Munger, Charles Walter Collins, E. A. McGregor, A. B. Clawson, Warren Fales Draper, Jason L. Merrill, Samuel Henry Ayers, William Trimble Johnson, Clarence William Kitchen, Thomas Henry Jones, Hadleigh Marsh, Herbert Hager Mowry, Warren Clemmer Funk, Frank Cummings Cook, Francis Burzley Milliken, Albert Franklin Burgess, John T. Bowen, Lyster Hoxie Dewey, William H. White, Otto William Schleussner, Fred Hebard Hillman, Harold Nelson Humphrey, William Henry Waggaman, Carl William Thompson, George Asbury McMurdo, Howard Archibald Turner, James Edmund Pennybacker, John Frank Strauss, John Regester Humphrey, United States. Office of Public Roads, Frank Lawrence McDonough, Robert Harris Hutchison, William Bohler Walker, William Horace Kerr