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Subject
Transportation
112
Geoscientific Information
18
Geomagnetism
10
Roads
7
Inland Waters
5
Railroads
5
Boundaries
4
Faults (Geology)
4
transportation
4
Administrative and political divisions
3
Drainage
3
Ferry routes
3
Highways
3
Hydrology
3
Power resources
3
Rivers
3
Aqueducts
2
Boundary disputes
2
Coasts
2
Counties
2