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- Bodies of water 79
- Bridges--Design and construction 3
- Canals 4
- Canals--Design and construction--Costs 4
- Cascade Range 1
- Dams--Design and construction 4
- Exports 1
- Government publications 1
- Harbors 13
- Jetties 13
- Locks (Hydraulic engineering) 8
- Maps 4
- Northwest, Pacific 186
- Photography 3
- Piling (Civil engineering) 3
- Railroad construction & maintenance 2
- Railroad engineering 47
- Railroads 2
- Railroads--Design and construction 1
- Rapids 13