1. Dep. of Civil Engineering; School of Earth, Environmental and Marine Sciences, Univ. of Texas-Rio Grande Valley; Edinburg TX 78539
2. Math and Science Division; Volunteer State Community College; Gallatin TN 37066
3. Dep. of Earth and Planetary Sciences; Univ. of Tennessee; Knoxville TN 37996
4. Dep. of Preventive and Restorative Dental Sciences, Division of Biomaterials and Bioengineering; Univ. of California; San Francisco CA 94143