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Topic
- Harbors 16
- River engineering 16
- River surveys 16
- United States. Congress--Records and correspondence 16
- Bodies of water 15
- Rivers 15
- River channels 13
- Northwest, Pacific 8
- West (U.S.) 8
- Canals 7
- Bridges--Design and construction 5
- Rapids 5
- United States--Armed Forces--Organization--Charts, diagrams, etc 5
- Exports 1
- Jetties 1
- Riparian areas 1
- Transportation 1
