Donald Winkelmann / Edward B. Jakubauskas / Geoffrey Seddon Shepherd / George M. Beal / Iowa State University. Dept. of Agronomy / John Joseph Hanway / Jon Doerflinger / Milton Webster Weller / W. H. Thompson / Wilbur R. Maki / Cecil S. Spatcher / Herbert George Lingren / Wilton Phelan Thompson-Barahona / Joe M. Bohlen | 