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- Bodies of water 22
- River channels 22
- River engineering 22
- Rivers 22
- United States. Congress--Records and correspondence 22
- River surveys 21
- Harbors 14
- Canals 12
- Northwest, Pacific 12
- West (U.S.) 10
- Rapids 9
- United States--Armed Forces--Organization--Charts, diagrams, etc 9
- Bridges--Design and construction 6