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Subjects
- Pennsylvania -- epidemiology[remove]3
- Air Pollution -- adverse effects1
- Climate1
- College of Physicians of Philadelphia.1
- Disease Outbreaks1
- New York -- epidemiology1
- Protective Factors1
- Respiratory Tract Diseases -- chemically induced1
- Respiratory Tract Diseases -- epidemiology1
- Smog -- adverse effects1
- Tuberculosis, Pulmonary -- epidemiology1
- Tuberculosis, Pulmonary -- prevention & control1
- Yellow Fever1