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Topic
- Bodies of water 34
- Bridges--Design and construction 7
- Canals 13
- Canals--Design and construction--Costs 1
- Conservation of natural resources 1
- Dams--Design and construction 1
- Exports 1
- Government publications 1
- Harbors 33
- Jetties 2
- Locks (Hydraulic engineering) 1
- Maps 1
- Northwest, Pacific 38
- Railroad construction & maintenance 1
- Railroad engineering 2
- Rapids 13
- Riparian areas 5
- River channels 22
- River engineering 65
- River surveys 33