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Transportation
15
Boundaries
9
Environment
7
Structure
7
Airports
5
Administrative and political divisions
4
Elevation
4
Quality
4
Quality control
4
Topographic maps
4
Wetlands
4
Bridges
3
Cities and towns
3
Coasts
3
Hydrology
3
Location
3
Rapids
3
Rivers
3
Runways (Aeronautics)
3
Towers
3