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- United States20
- Military Medicine10
- American Civil War9
- General Surgery9
- Commerce2
- Federal Government2
- Meteorology -- organization & administration2
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- American Public Health Association.1
- Back Pain -- etiology1
- Back Pain -- therapy1
- Data Collection1
- District of Columbia1
- Education, Medical1
- Epidemics1
- Exercise Therapy1
- Government Publications as Topic1
- Hagen, Hermann August, 1817-1893.1
- Hygiene1