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Topic
- Canals--Design and construction--Costs 11
- Dams--Design and construction 11
- Bodies of water 10
- Northwest, Pacific 10
- Rivers 10
- Transportation 10
- Water resources development 10
- West (U.S.) 10
- River engineering 2
- River surveys 2
- United States--Appropriations and expenditures 2
- Locks (Hydraulic engineering) 1
