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- Bodies of water 11
- River engineering 11
- River surveys 11
- Rivers 11
- United States. Congress--Records and correspondence 11
- River channels 10
- Harbors 9
- Canals 7
- Northwest, Pacific 7
- United States--Armed Forces--Organization--Charts, diagrams, etc 7
- Bridges--Design and construction 6
- Rapids 6
- West (U.S.) 4