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Subject
Transportation
34
Geoscientific Information
13
Groundwater
7
Hydrogeology
7
Inland Waters
7
Basins (Geology)
6
Coasts
6
Ocean bottom
6
Oceans
6
Railroads
4
Elevation
3
Faults (Geology)
3
Folds (Geology)
3
Local transit
3
Street-railroads
3
Roads
2
Bus travel
1
Buses
1
National Highway System
1
Railroad tunnels
1