1. Air Pollution and Chest Disease
PETER V.V. HAMILL, M.D. 
Diseases of the Chest 
Volume 39, Issue 5, Pages (May 1961)
DOI: /chest
Copyright © 1961 The American College of Chest Physicians Terms and Conditions

2. FIGURE 1
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1961 The American College of Chest Physicians Terms and Conditions

3. FIGURE 2
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1961 The American College of Chest Physicians Terms and Conditions