1. Agricultural and Environmental Research Station; Gus R. Douglass Land-Grant Institute, West Virginia State Univ.; Institute WV 25112
2. USDA, Agricultural Research Service, Appalachian Farming Systems Research Center; 1224 Airport Rd. Beaver WV 25813-9423
3. USDA, Agricultural Research Service, Southern Regional Research Center; 1100 Robert E. Lee Blvd. New Orleans LA 70124