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- United States. Congress--Records and correspondence 138
- Northwest, Pacific 115
- River engineering 109
- Bridges--Design and construction 16
- United States--Appropriations and expenditures 16
- River surveys 14
- Rapids 13
- Harbors 12
- Jetties 5
- Riparian areas 4
- Transportation 4
- Canals 3
- Exports 1
- Government publications 1
- Military maps 1
- Military topography 1
- Steamboats 1