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Topic
- Bodies of water 27
- Canals--Design and construction--Costs 26
- Northwest, Pacific 26
- Rivers 26
- Transportation 26
- Water resources development 26
- West (U.S.) 26
- Dams--Design and construction 25
- Government publications 2
- River engineering 2
- United States--Appropriations and expenditures 2
- Bridges--Design and construction 1
- Railroad construction & maintenance 1
- United States. Congress--Records and correspondence 1