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Topic
- West (U.S.) 31
- Bodies of water 27
- Canals--Design and construction--Costs 27
- Dams--Design and construction 27
- Transportation 27
- Northwest, Pacific 26
- Rivers 26
- Water resources development 26
- River engineering 5
- United States--Appropriations and expenditures 5
- Cascade Range 1
- Locks (Hydraulic engineering) 1
- Railroad engineering 1
- River surveys 1
