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Topic
- West (U.S.) 34
- Bodies of water 32
- Rivers 30
- Northwest, Pacific 29
- Canals--Design and construction--Costs 28
- Dams--Design and construction 28
- Transportation 28
- Water resources development 26
- River engineering 18
- United States--Appropriations and expenditures 12
- River surveys 10
- United States. Congress--Records and correspondence 7
- Government publications 4
- Harbors 4
- River channels 4
- Bridges--Design and construction 2
- Canals 2
- Locks (Hydraulic engineering) 2
- Railroad engineering 2
- Cascade Range 1