1. Agronomy Dep. Iowa State Univ. 2101 Agronomy Hall Ames IA 50011
2. Monsanto Company 503 S. Maplewood Williamsburg IA 52361
3. Dep. of Geography and Meteorology Valparaiso Univ. 1809 Chapel Dr. Valparaiso IN 46383‐6493
4. Dpto. Produccion Vegetal, Fitotecnia Univ. Politecnica de Madrid 28040 Madrid Spain
5. Syngenta Seeds Washington IA 52353