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Subjects
- Pan American Health Organization1
- Patents as Topic1
- Peer Review, Research1
- Pennsylvania1
- Pennsylvania -- epidemiology1
- Pennsylvania. Governor (1790-1799 : Mifflin)1
- Philadelphia16
- Philadelphia -- epidemiology26
- Physicians1
- Plague3
- Plague -- history5
- Pneumonia1
- Public Health9
- Public Health Administration2
- Publishing1