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Subject
Transportation
10
Boundaries
6
Airports
4
Coasts
4
Elevation
4
Environment
4
Structure
4
Topographic maps
4
Glaciers
3
Location
3
Quality
3
Quality control
3
Wetlands
3
Administrative and political divisions
2
Cities and towns
2
Cliffs
2
Communication
2
Dams
2
Electric power transmission
2
Fault zones
2