by Arthur Edward Tomhave, C. R. Runk, Charles Conger Palmer, Claude L. Benner, Louis Reinhold Detjen, Philip B. Myers, Thomas Franklin Manns, University of Delaware. Agricultural Experiment Station, Carroll W. Mumford, George Franklin Gray, George L. Baker, H. R. Baker, Harry S. Gabriel

1927

by James Henry Dunham, Leicester Bodine Holland, Richard Elijah Clark, Thomas Franklin Manns

1915

by Augustine Dawson Selby, B. E. Carmichael, Carlos Grant Williams, Charles Embree Thorne, Ernest Browning Forbes, Frank H. Ballou, Ohio Agricultural Experiment Station, Thomas Franklin Manns, Frank Aldis Welton

1909

by Thomas Franklin Manns

1914