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Dams
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39
Rivers
34
Canals
33
Bridges
32
Railroads
32
Railroads and state
32
Transportation
32
Water
32
Inland Waters
7
Hydrography
6
Location
6
Flood control
5
Hazard mitigation
5
Klamath River (Or. and Calif.)
2
Bodies of water
1
Boundaries
1
Groundwater recharge
1
Reservoirs
1
Stream channelization
1
Structure
1