1. a The Dow Chemical Company, Health and Environmental Sciences, 1803 Building, Midland, MI 48674
2. b E.I. du Pont de Nemours and Company, Inc., Fibers Department, Chestnut Run Plaza, Wilmington, DE 19880-0702
3. c Shaw Industries, Inc., Technical Services, P.O. Drawer 2128, Dalton, GA 30720
4. d Ciba-Geigy Corporation, Dyestuffs and Chemicals Division, P.O. Box 18300, Greensboro, NC 27419
5. e Air Quality Sciences, Inc., 1331 Capital Circle, Atlanta, GA 30067