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- Bodies of water 23
- Canals--Design and construction--Costs 23
- Dams--Design and construction 23
- Northwest, Pacific 23
- Rivers 23
- Transportation 23
- Water resources development 23
- West (U.S.) 23
- 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
