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Topic
- Canals--Design and construction--Costs 21
- Dams--Design and construction 21
- Bodies of water 20
- Northwest, Pacific 20
- Rivers 20
- Transportation 20
- Water resources development 20
- West (U.S.) 20
- River engineering 2
- River surveys 2
- United States--Appropriations and expenditures 2
- Government publications 1
- Locks (Hydraulic engineering) 1
