1. Western Ecology Division; U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Lab.; 200 SW 35th St. Corvallis OR 97333
2. National Research Council Associate; 200 SW 35th St. Corvallis OR 97333
3. Dep. of Plant Science; Univ. of Connecticut; Storrs CT 06269
4. U.S. Environmental Protection Agency