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- Bodies of water 14
- River engineering 14
- Rivers 14
- United States. Congress--Records and correspondence 14
- River surveys 12
- River channels 10
- Northwest, Pacific 9
- Government publications 8
- Harbors 7
- Canals 6
- Rapids 5
- West (U.S.) 5
- Stream conservation 4
- United States--Armed Forces--Organization--Charts, diagrams, etc 3