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- River engineering 5
- United States--Appropriations and expenditures 5
- River surveys 4
- Bodies of water 1
- Bridges--Design and construction 1
- Canals--Design and construction--Costs 1
- Cascade Range 1
- Dams--Design and construction 1
- Locks (Hydraulic engineering) 1
- Railroad construction & maintenance 1
- Railroad engineering 1
- Transportation 1
- United States. Congress--Records and correspondence 1
- West (U.S.) 1