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Topic
- Bodies of water 15
- River channels 15
- River engineering 15
- Rivers 15
- United States. Congress--Records and correspondence 15
- River surveys 14
- Canals 11
- Northwest, Pacific 10
- Harbors 9
- United States--Armed Forces--Organization--Charts, diagrams, etc 8
- Rapids 7
- Bridges--Design and construction 6
- West (U.S.) 5
