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- Canals--Design and construction--Costs 21
- Dams--Design and construction 21
- Bodies of water 20
- Northwest, Pacific 20
- Rivers 20
- Transportation 20
- Water resources development 20
- West (U.S.) 20
- Locks (Hydraulic engineering) 1
- River engineering 1
- River surveys 1
- United States--Appropriations and expenditures 1
