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- River engineering 6
- United States. Congress--Records and correspondence 6
- River surveys 5
- Bodies of water 4
- Harbors 4
- River channels 4
- Rivers 4
- Northwest, Pacific 3
- West (U.S.) 3
- Canals 2
- Bridges--Design and construction 1
- Exports 1
- Jetties 1
- Rapids 1
- Riparian areas 1
- Transportation 1
- United States--Armed Forces--Organization--Charts, diagrams, etc 1