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- Canals--Design and construction--Costs 12
- Dams--Design and construction 12
- Northwest, Pacific 12
- Transportation 12
- Bodies of water 11
- West (U.S.) 11
- Rivers 10
- Water resources development 10
- River engineering 8
- River surveys 6
- United States--Appropriations and expenditures 6
- United States. Congress--Records and correspondence 3
- Locks (Hydraulic engineering) 2
- Bridges--Design and construction 1
- Canals 1
- Cascade Range 1
- Exports 1
- Harbors 1
- Jetties 1
- Railroad construction & maintenance 1