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Subject
Airports
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19
Transportation
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19
Structure
7
Location
6
Geoscientific Information
4
Air bases
3
Military
3
Military bases
3
Air travel
2
Agriculture
1
Airplanes
1
Airport buildings
1
Airport control towers
1
Biology and Ecology
1
Boundaries
1
Bus stops
1
Cemeteries
1
Cities and towns
1
Farming
1
Ferries
1