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- Bodies of water 3
- Canals--Design and construction--Costs 3
- Dams--Design and construction 3
- Northwest, Pacific 3
- Rivers 3
- Transportation 3
- Water resources development 3
- West (U.S.) 3
- Bridges--Design and construction 1
- Railroad construction & maintenance 1
- River engineering 1
- United States--Appropriations and expenditures 1
- United States. Congress--Records and correspondence 1