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Canals
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64
Rivers
48
Water
38
Transportation
34
Bridges
33
Dams
33
Railroads
33
Railroads and state
32
Inland Waters
14
Hydrography
9
Drainage
6
Aqueducts
5
Hydrology
4
Lakes
4
Reservoirs
4
Streams
4
Waterways
3
Coasts
2
Economy
2
Geoscientific Information
2