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Runways (Aeronautics)
8
Salt mines and mining
8
Towers
8
Human settlements
7
Vegetation boundaries
7
Contours (Cartography)
6
Electric power transmission
6
Fuelbreaks
6
Hydrographic surveying
6
Lakes
6
Marine accidents
6
Marshes
6
Navigation
6
Reefs
6
Reservoirs
6
Roads
6
Swamps
6
Trails
6
Trees
6
Vegetation classification
6