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- River surveys 6
- United States--Appropriations and expenditures 6
- River engineering 5
- Transportation 3
- Canals--Design and construction--Costs 2
- Dams--Design and construction 2
- Locks (Hydraulic engineering) 2
- United States. Congress--Records and correspondence 2
- Bodies of water 1
- Cascade Range 1
- Military maps 1
- Military topography 1
- Railroad engineering 1
- West (U.S.) 1
