References
- Sept 1968 . Chronic Respiratory Disease Screening Manual , Sept , New York : Ad Hoc Committee in Screening for Chronic Respiratory Diseases, Tuberculosis and Health Association of California, National Tuberculosis and Respiratory Disease Association .
- et al. A Survey for Chronic Respiratory Disease in an Industrial City Amer Rev Resp Dis Nov 1962 86 675 685
- Weiss , W. 1968 . Validation of a Screening Procedure for Chronic Non-Specific Respiratory Disease . Arch Environ Health , 16 June : 844 – 852 .