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Subject
Transportation
6
Airports
4
Elevation
4
Topographic maps
4
Towers
4
Aqueducts
2
Buildings
2
Cities and towns
2
Coasts
2
Communication
2
Demography
2
Environment
2
Geysers
2
Hot springs
2
Human settlements
2
Hydrographic surveying
2
Hydrography
2
Industrial sites
2
Location
2
Marine accidents
2