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Subject
Rivers
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40
Canals
33
Bridges
32
Dams
32
Railroads
32
Railroads and state
32
Transportation
32
Water
32
Inland Waters
8
Waterways
5
Hydrography
3
Bodies of water
1
Lagoons
1
Lakes
1
Location
1
Ravines
1
Reservoirs
1
Wetlands
1