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Transportation
8
Boundaries
5
Environment
4
Structure
4
Elevation
3
Hydrographic surveying
3
Hydrography
3
Hydrology
3
Quality
3
Quality control
3
Topographic maps
3
Administrative and political divisions
2
Airports
2
Aqueducts
2
Cities and towns
2
Coasts
2
Communication
2
Dams
2
Inland Waters
2
Location
2