1. Accident Facts. Chicago, National Safety Council, 1969, pp. 12 and 81.
2. Congenital esophageal stenosis;Bluestone;Laryngoscope,1969
3. Foreign body complications;Bunker;Laryngoscope,1961
4. Bronchoscopy and asthmatoid respiration;Friedberg;J.A.M.A.,1943
5. Foreign bodies in the air and food passages;Holinger;Trans. Amer. Acad. Ophthal. Otolaryng.,1962