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Topic
- West (U.S.) 34
- Bodies of water 30
- Rivers 29
- Canals--Design and construction--Costs 27
- Dams--Design and construction 27
- Transportation 27
- Northwest, Pacific 26
- Water resources development 26
- River engineering 8
- United States--Appropriations and expenditures 5
- River surveys 4
- River channels 3
- United States. Congress--Records and correspondence 3
- Harbors 2
- Canals 1
- Cascade Range 1
- Locks (Hydraulic engineering) 1
- Railroad engineering 1
- Rapids 1
- United States--Armed Forces--Organization--Charts, diagrams, etc 1