Proceedings of a symposium - Sleper, D. A.,; Barker, T. C.,; Bramel-Cox, P. J.,; Francis, C. A.,; Smith, M. E.,; Stuber, C. W.,; Peterson, G. A.,; Ernst, Susan, (Crop Science Society of America, Inc. ; American Society of Agronomy, Inc., 1991)
CSSA Special Publication Number 18.