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Transportation
13
Boundaries
8
Elevation
7
Topographic maps
7
Wetlands
5
Administrative and political divisions
4
Airports
4
Cities and towns
4
Coasts
4
Location
4
Quality
4
Quality control
4
Environment
3
Hydrology
3
Structure
3
Towers
3
Vegetation boundaries
3
Water
3
Aqueducts
2
Communication
2