1. Biosystems Engineering and Soil Science; Univ. of Tennessee; 2506 E.J. Chapman Dr. Knoxville TN 37996-4531
2. Environmental Science and Engineering; Colorado School of Mines; Coolbaugh Hall 310 Golden CO 80401-1887
3. Dep. of Earth Sciences; Florida International Univ
4. Dep. of Earth and Planetary Sciences; Univ. of Tennessee; Knoxville TN 37996-1410