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Topic
- River engineering 8
- United States. Congress--Records and correspondence 6
- Northwest, Pacific 5
- River surveys 3
- United States--Appropriations and expenditures 3
- Bridges--Design and construction 1
- Canals 1
- Dams--Design and construction 1
- Exports 1
- Harbors 1
- Jetties 1
- Railroad construction & maintenance 1
- Riparian areas 1
- Transportation 1
