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- Bodies of water 32
- Bridges--Design and construction 2
- Canals 2
- Canals--Design and construction--Costs 28
- Cascade Range 1
- Dams--Design and construction 28
- Exports 1
- Government publications 4
- Harbors 4
- Jetties 1
- Locks (Hydraulic engineering) 2
- Northwest, Pacific 29
- Railroad construction & maintenance 1
- Railroad engineering 2
- Rapids 1
- Riparian areas 1
- River channels 4
- River engineering 18
- River surveys 10
- Rivers 30