Subjects
- Account books9
- Railroads - Baltimore and Ohio Railroad.8
- Transportation7
- Politics and government.6
- Railroads6
- Rivers and river valleys.6
- Diaries and journals.5
- General stores4
- Labor organization. SEE ALSO Coal mining - labor4
- Slaves and slavery.4
- Steamboats4
- Unions.4
- Birth, marriage, and death records.3
- Bridges3
- Broadsides.3