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Subject
- Railroads12
- Real property9
- Administrative and political divisions4
- Geology3
- Streets3
- Description and travel2
- Land grants2
- Landowners2
- Mines and mineral resources2
- Nautical charts2
- Anthracite coal1
- Bicycle touring1
- Bituminous coal1
- Bituminous coal mines and mining1
- Chautauquas1
- Climate1
- Coalfields1
- Coasts1
- Colonies1
- Discovery and exploration1
