1. Dep. of Agricultural and Consumer Economics Univ. of Illinois at Urbana‐Champaign 307 Mumford Hall. 1301 W. Gregory Urbana IL 61801‐3028
2. College of Applied Science and Technology Illinois State Univ. Clarence R Ropp Agriculture Building RAB 143 Normal IL 61790‐5020
3. Dep. of Crop and Soil Sciences Washington State Univ. Johnson Hall 245 Pullman WA 99164‐1009
4. Land Resources and Environmental Sciences Montana State Univ. Bozeman 334 Leon Johnson Hall Bozeman MT 59717‐2000
5. Biological Systems Engineering Univ. of Nebraska 204 L.W. Chase Hall Lincoln NE 68588
6. School of Plant, Environmental and Soil Sciences Louisiana State Univ. Sturgis Hall 104 Baton Rouge LA 70803‐2804
7. Dep. of Agronomy and Horticulture Univ. of Nebraska 102 D Keim Hall Lincoln NE 68583
8. Dep. of Crop Sciences Univ. of Illinois at Urbana‐Champaign 1102 S Goodwin Ave. Urbana IL 61801‐3028