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Subjects
- Physicians3
- United States2
- Boston1
- Camping1
- Child1
- Geography1
- History, 19th Century1
- Jackson, John D. (John Davies), 1834-1875.1
- Kentucky1
- Maryland1
- Medical and Chirurgical Faculty of the State of Maryland.1
- Pennsylvania1
- Poverty1
- Public Health1
- Sanitation1
- Societies, Medical -- history1
- Storer, Horatio Robinson, 1830-1922.1
- Urban Population1