Subjects
- Vaccination -- United States -- History -- 19th century2
- Aging1
- Communicable Disease Control -- History1
- Communicable diseases1
- Disease Transmission, Infectious -- History1
- Epidemics1
- International trade1
- Older people -- Health and hygiene1
- Older people -- Psychology1
- Tax collection -- United States -- History1
- Yellow Fever -- History1