Subject
- Coal (17)
- Land Use (8)
- Cities and Towns (4)
- Counties (4)
- Forest Reserves (4)
- Indian Reservations (4)
- Military Bases (3)
- Public Lands (3)
- Coal Mines and Mining (2)
- Railroads (2)
- Canals (1)
- Geology (1)
- Gold (1)
- Iron Industry and Trade (1)
- Land Grants (1)
- Mines and Mineral Resources (1)
- Natural Gas (1)
- Petroleum (1)
- Steamboat Lines (1)
- Trails (1)
