1. a E. I. du Pont de Nemours and Company , Wilmington, Delaware
2. b Organic Chemicals Department, Medical Division , Chambers Works, E. I. du Pont de Nemours and Company , Penns Grove, New Jersey
3. c Elastomers Chemicals Department, Research Division , Experimental Station, E. I. du Pont de Nemours and Company , Wilmington, Delaware
4. d Formerly Analytical Research Division , Jackson Laboratory, E. I. du Pont de Nemours and Company , Penns Grove, New Jersey