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- River engineering 8
- United States--Appropriations and expenditures 8
- River surveys 4
- West (U.S.) 4
- Bodies of water 2
- Dams--Design and construction 2
- Locks (Hydraulic engineering) 2
- Railroad engineering 2
- Bridges--Design and construction 1
- Canals--Design and construction--Costs 1
- Cascade Range 1
- Railroad construction & maintenance 1
- Transportation 1
- United States. Congress--Records and correspondence 1
