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- River engineering 10
- Northwest, Pacific 6
- Jetties 4
- River surveys 4
- Locks (Hydraulic engineering) 3
- Rivers 3
- United States--Appropriations and expenditures 3
- Bodies of water 2
- Canals--Design and construction--Costs 2
- Dams--Design and construction 2
- Railroad engineering 2
- Transportation 2
- United States. Congress--Records and correspondence 2
- West (U.S.) 2
- Bridges--Design and construction 1
- Canals 1
- Cascade Range 1
- Exports 1
- Harbors 1
- Maps 1