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Parks
9
Recreation areas
9
Runways (Aeronautics)
9
Towers
9
Hydrographic surveying
8
Mines and mineral resources
8
Salt mines and mining
8
Aqueducts
7
Dams
7
Inland Waters
7
Marine accidents
7
Navigation
7
Reefs
7
Vegetation boundaries
7
Buildings
6
Cliffs
6
Communication
6
Contours (Cartography)
6
Demography
6
Fault zones
6