1. South Central Research & Extension Center; University of Nebraska; Box 66 Clay Center NE 68933
2. West Central Research & Extension Center; 461 West University Dr. North Platte NE 69101
3. USDA; Soil & Water Conservation Unit; 279 Plant Science, University of Nebraska Lincoln NE 68583-0915
4. National Center for Environmental Health, Mailstop F42, Centers for Disease Control and Prevention; 1600 Clifton Rd. N.E. Atlanta GA 30333
5. Dept. of Civil Engineering; 220 Cobleigh Hall, Montana State University Bozeman MT 59717-3900
6. Pioneer Hi-Bred Int'l.; 7100 N.W. 62nd Avenue Johnstown IA 50131-1150