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Trails
5
Electric lines
4
Electric power transmission
4
Embankments
4
Fills (Earthwork)
4
Railroads
4
Refuse and refuse disposal
4
Waste disposal sites
4
Ferries
3
Harbors
3
Hydrographic structures
3
Industrial sites
3
Piers
3
Sand
3
Soil and civilization
3
Tunnels
3
Wharves
3
Breakwaters
2
Chimneys
2
Cooling towers
2