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Subject
Transportation
5
Boundaries
2
Structure
2
Administrative and political divisions
1
Bridges
1
Cliffs
1
Communication
1
Contours (Cartography)
1
Dams
1
Electric lines
1
Electric power transmission
1
Elevation
1
Embankments
1
Environment
1
Fault zones
1
Ferries
1
Fills (Earthwork)
1
Fuelbreaks
1
Glaciers
1
Hydraulic structures
1