1. E. I. DuPont de Nemours & Co., Wilmington, Del. A guide book on designing with DuPont engineering plastics.
2. Wilkens, C.A., E.I. DuPont de Nemours & Co., Wilmington, Del.
3. Enicks, J.H., Enroc Laboratories Developmental Co., Greenville, Ohio.
4. Halberstady, L., Rubber Division, Acushnet Process Co., New Bedford, Mass.
5. Silastic no. 390, Dow Corning Corp., Medical Products Division, Midland, Mich.