1. Penn State Univ., Dept. of Engineering Science and Mechanics, 212 Earth and Engineering Science Building, University Park, PA 22307.
2. 203 N. La Salle St., Suite 1675, Chicago, IL 60601.
3. 303 Townsend Hall, Univ. of Missouri, Columbia, MO 65211.
4. 500 Fifth St., NW, Washington, DC 20001.