1. Asst. Engrg. Specialist, Dept. of Transp., Ofc. of Transp. Lab., 5900 Folsom Blvd., Sacramento, CA 95819
2. Assoc. Prof., Dept. of Civ. Engrg., Oregon State Univ., Corvallis, OR 97331
3. Retired Asst. Engr. of Matls., Oregon Dept. of Transp., Salem, OR 97310