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- Canals--Design and construction--Costs 3
- Locks (Hydraulic engineering) 3
- River engineering 3
- United States--Appropriations and expenditures 3
- Dams--Design and construction 2
- River surveys 2
- West (U.S.) 2
- Bodies of water 1
- Cascade Range 1
- Railroad engineering 1
- Transportation 1
