1. American Conference of Governmental Industrial Hygienists Documentation of Threshold Limit Values rev. 33 (1966).
2. ENVIRON HEALTH LETTE 7: 2 (1968).
3. Smoking and Health: A Report of the Advisory Committee to the Surgeon General of the Public Health Service 1964
4. Standards for Ambient Air Quality and Motor Vehicle Exhaust 1959
5. The Health Consequences of Smoking: A Public Health Service Review 1968