1. Tunnel Engineer, Parsons Brinckerhoff Quade & Douglas Inc., 469 Seventh Ave., New York, NY 10018.
2. Associate Professor, Polytechnic Univ., 6 Metrotech Ctr., Brooklyn, NY 11201.
3. Graduate Research Assistant, Polytechnic Univ., 6 Metrotech Ctr, Brooklyn, NY 11201.