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Topic
- Canals 13
- River engineering 13
- United States. Congress--Records and correspondence 13
- Bodies of water 12
- River channels 12
- River surveys 12
- Rivers 12
- Northwest, Pacific 10
- United States--Armed Forces--Organization--Charts, diagrams, etc 9
- Rapids 8
- Harbors 7
- Bridges--Design and construction 5
- West (U.S.) 3
- Exports 1
- Jetties 1
- Riparian areas 1
- Transportation 1
