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Subject
- Transportation[remove]210
- Airports75
- Runways (Aeronautics)46
- Roads30
- Trails23
- Ferries18
- Railroads18
- Bridges17
- Structure17
- Location2
- Transportation--Canada2
- Transportation--United States2
- Air travel1
- Airport buildings1
- Border crossing1
- Border stations1
- Bus stops1
- Interstate Highway System1
- Passenger trains1
- Ports of entry1