1. Ecosystems Research Division, National Exposure Research Lab.; U.S. Environmental Protection Agency; 960 College Station Road Athens GA 30605-2700
2. Dep. of Chemistry; Univ. of Victoria; P.O. Box 3065 Victoria BC V8W 3V6 Canada
3. Equifax Decision Systems; External Mail Drop 425, 1525 Windward Concourse Alpharetta GA 30202
4. Dep. of Soil Science and Plant Nutrition; Wageningen Agricultural Univ.; Wageningen the Netherlands