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Topic
- River engineering 14
- Rivers 14
- Bodies of water 13
- River surveys 13
- United States. Congress--Records and correspondence 13
- River channels 12
- Harbors 11
- West (U.S.) 7
- Bridges--Design and construction 6
- Canals 6
- Northwest, Pacific 6
- United States--Armed Forces--Organization--Charts, diagrams, etc 6
- Rapids 5
- Dams 1
- Hydroelectric power plants 1
- Water-power 1
