Green, John R.; Hayes, Dermot J.; Khan, Linda; Kihl, Young Whan; Knipe, C. Lynn; Olson, Dennis; Ramaswami, Sridhar; Rust, Robert; Sapp, Stephen G.; Seim, Emerson L.; Wahl, Thomas I.; Clemens, Roxanne L.

Midwest Agribusiness Trade Research and Information Center, Iowa State University, Des Moines, Iowa, and Ames, Iowa, (1990)