1. Environmental Geochemistry Lab.; Univ. of Texas at San Antonio; San Antonio TX 78249
2. Biological Sciences; Michigan Technological University; Houghton MI 49931
3. Dep. of Earth and Environmental Studies; Montclair State Univ.; Montclair NJ 07043
4. International Institute for the Environment and Public Health in association with the Harvard School of Public Health; Nicosia 1105 Cyprus
5. Dep. of Chemistry; Univ. of Texas at San Antonio; San Antonio TX 78249
6. Dep. of Biology; Western Kentucky Univ.; Bowling Green KY 42101