Subjects
- Lumber trade4
- Medicine. SEE ALSO Folk medicine.1
- Mills and mill-work2
- Missionaries2
- Petroleum industry and trade2
- Physicians - letters and papers.1
- Politics and government.4
- Printers and printing.1
- Railroads2
- Railroads - Monongahela Valley Railroad.1
- Rivers and river valleys.4
- Salt industry and trade1
- Schools. SEE ALSO Academies1
- Sheep2
- Slaves and slavery.2