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Subject
Transportation
16
Airports
10
Elevation
8
Topographic maps
8
Towers
8
Coasts
6
Location
6
Marine accidents
6
Navigation
6
Rapids
6
Reefs
6
Rivers
6
Waterfalls
6
Cities and towns
5
Demography
5
Geysers
5
Hot springs
5
Human settlements
5
Physiographys
5
Population
5