1. Chief of Design, US Air Force, 300 Miracle Strip Pkwy., Unit 1A, Ft. Walton Beach, FL 32548.
2. Geochemist, Illinois State Geological Survey, 615 E. Peabody Dr., Champaign, IL 61820.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801.
4. Graduate Engineer II, Minnesota Pollution Control Agency, 520 Lafayette Rd. North, St. Paul, MN 55155.