Genres
- History
- Social conditions
- Social values
- British
- Social evolution
- Correspondence
- Social life and customs
- Genealogy
- Water resources development
- Nature
- New Deal, 1933-1939
- Agriculture and state
- Ciphers
- Local History
- Carnegie Institution of Washington
- Politics and government
- United States
- United States. Continental Congress
- Agriculture
- Economic aspects
- Tennessee Valley Authority
- Maryland, history
- Civilization
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