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Topic
- United States--Appropriations and expenditures 15
- River engineering 14
- River surveys 7
- West (U.S.) 6
- Bodies of water 3
- Dams--Design and construction 3
- Locks (Hydraulic engineering) 3
- Railroad engineering 3
- Transportation 3
- Bridges--Design and construction 2
- Canals--Design and construction--Costs 2
- Cascade Range 1
- Northwest, Pacific 1
- Railroad construction & maintenance 1
- United States. Congress--Records and correspondence 1