1. Professor of Civil Engineering, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801.
2. Assistant Professor of Civil Engineering, Univ. of Akron, 209D ASEC, Akron, OH 44325-3905.
3. Research Civil Engineer, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180-6199.