1. Dep. of Petroleum and Geosystems Engineering; Univ. of Texas at Austin; Austin TX 78712
2. Dep. of Earth and Environmental Sciences; Wright State Univ.; Dayton OH 45435
3. Dep. of Physics; Wright State Univ.; Dayton OH 45435
4. Dep. of Agronomy; Iowa State Univ.; Ames IA 50011