1. Professor, Civil and Geological Engineering Dept. New Mexico State Univ., Las Cruces, NM 88003-8001.
2. Associate Professor, Engineering Technology Dept., New Mexico State Univ., Las Cruces, NM 88003-8001.
3. Associate Director, NM Space Grant Consortium, New Mexico State Univ., Las Cruces, NM 88003-8001.
4. Research Associate, NM Space Grant Consortium, New Mexico State Univ., Las Cruces, NM 88003-8001.