1. Department of Geography and Environmental Engineering, U.S. Military Academy, West Point, New York 10996
2. Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853
3. USDA-Agricultural Research Service, J. Phil Campbell, Senior, Natural Resource Conservation Center, Watkinsville, Georgia 30677
4. Department of Chemistry and Life Science, U.S. Military Academy, West Point, New York 10996