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Topic
- Northwest, Pacific 29
- Bodies of water 28
- Rivers 27
- Transportation 27
- Canals--Design and construction--Costs 26
- Water resources development 26
- West (U.S.) 26
- Dams--Design and construction 25
- River engineering 5
- United States. Congress--Records and correspondence 4
- Government publications 2
- Harbors 2
- River surveys 2
- United States--Appropriations and expenditures 2
- Bridges--Design and construction 1
- Canals 1
- Exports 1
- Jetties 1
- Railroad construction & maintenance 1
- Rapids 1
