1. US Geological Survey; 2280 Woodale Drive Mounds View MN 55112
2. US Geological Survey; 345 Middlefield Rd. Menlo Park CA 94025
3. US Geological Survey; 4165 Spruance Rd. San Diego CA 92101
4. US Geological Survey; PO Box 25046, M.S. 966 Denver CO 80225
5. Univ. of Florida; 287 Frazier Rogers Hall Gainesville FL 32611-0570