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- Bodies of water 8
- Canals 8
- River channels 8
- River engineering 8
- River surveys 8
- Rivers 8
- United States--Armed Forces--Organization--Charts, diagrams, etc 8
- United States. Congress--Records and correspondence 8
- Rapids 7
- Northwest, Pacific 6
- Bridges--Design and construction 5
- Harbors 5
- West (U.S.) 2