1. Asst. Prof., Civ. Engrg. Dept., Lehigh Univ., Bethlehem, Pa.; formerly Research Assoc., Cornell Univ., Ithaca, N.Y.
2. Assoc. Prof., Civ. and Environmental Engrg. Dept., Cornell Univ., Ithaca, N.Y.
3. Prof., Civ. and Environmental Engrg. Dept., Cornell Univ., Ithaca, N.Y.