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Transportation
8
Boundaries
5
Environment
4
Hydrology
3
Location
3
Structure
3
Administrative and political divisions
2
Airports
2
Cities and towns
2
Coasts
2
Communication
2
Electric power transmission
2
Elevation
2
Human settlements
2
Hydrographic surveying
2
Mines and mineral resources
2
Quality
2
Quality control
2
Rapids
2
Rivers
2