Subjects
- Diphtheria5
- Kentucky5
- Medicine5
- New Orleans5
- New York City -- epidemiology5
- Ohio5
- Pennsylvania5
- Physicians5
- Sanitation5
- Scarlet Fever5
- South Carolina5
- Boston -- epidemiology4
- California4
- Communicable Disease Control4
- Communicable Diseases4
- Plague4
- Public Health Administration4
- Russia4
- Scotland4
- Yellow Fever -- etiology4
