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- United States--Appropriations and expenditures 39
- River engineering 35
- West (U.S.) 20
- River surveys 14
- Transportation 5
- Canals--Design and construction--Costs 4
- Dams--Design and construction 4
- Locks (Hydraulic engineering) 4
- Railroad engineering 3
- Bodies of water 2
- Bridges--Design and construction 2
- Cascade Range 1
- Railroad construction & maintenance 1
- United States. Congress--Records and correspondence 1