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Topic
- Bodies of water 11
- Harbors 11
- River engineering 11
- River surveys 11
- Rivers 11
- United States. Congress--Records and correspondence 11
- River channels 10
- West (U.S.) 6
- Bridges--Design and construction 5
- Canals 5
- Northwest, Pacific 5
- United States--Armed Forces--Organization--Charts, diagrams, etc 5
- Rapids 4
