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Subject
- Roads20
- Nautical charts11
- Federal aid to transportation10
- Transportation9
- Navigation6
- Geology3
- Harbors2
- Administrative and political divisions1
- Aeronautical charts1
- Antiquities, Celtic1
- Boundaries1
- Description and travel1
- Earthworks (Archaeology)1
- Forest reserves1
- Indian reservations1
- Indians of North America1
- Languages1
- Oil fields1
- Railroads1
- Real property1
