1. a Amoco Corporation, Department of Environmental Affairs and Safety, 200 East Randolph Drive, Chicago, IL 60601
2. b NATLSCO, Route 22, Long Grove, IL 60049
3. c IIT Research Institute, Life Sciences Research, 10 West 35th Street, Chicago, IL 60616
4. d Amoco Oil Company, Amoco Research Center, Warrenville Road and Mill Street, Naperville, IL 60566