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- Bodies of water 13
- River channels 13
- River engineering 13
- River surveys 13
- Rivers 13
- United States. Congress--Records and correspondence 13
- Harbors 10
- Canals 7
- United States--Armed Forces--Organization--Charts, diagrams, etc 7
- West (U.S.) 7
- Bridges--Design and construction 6
- Northwest, Pacific 6
- Rapids 6