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Transportation
12
Environment
7
Boundaries
6
Structure
5
Airports
4
Coasts
4
Elevation
4
Topographic maps
4
Location
3
Parks
3
Quality
3
Quality control
3
Recreation areas
3
Wetlands
3
Administrative and political divisions
2
Bridges
2
Cities and towns
2
Dams
2
Electric power transmission
2
Hydrography
2