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Subject
Transportation
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10
Location
4
Airports
2
Channels
2
Highways
2
Inland Waters
2
Intracoastal waterways
2
National Highway System
2
Rivers
2
Roads
2
Shipping
2
Transportation corridors
2
Airport terminals
1
Border crossing
1
Border stations
1
Boundaries
1
Bridges
1
Cities and towns
1
Evaluation
1
Freight and freightage
1