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Subject
Transportation
5
Airports
3
Structure
3
Towers
3
Aqueducts
2
Buildings
2
Cities and towns
2
Communication
2
Demography
2
Elevation
2
Geysers
2
Hot springs
2
Human settlements
2
Hydrographic surveying
2
Hydrography
2
Location
2
Physiographys
2
Population
2
Rapids
2
Rivers
2