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- River engineering 52
- United States. Congress--Records and correspondence 52
- Northwest, Pacific 38
- Bodies of water 29
- Rivers 29
- River surveys 28
- River channels 22
- Harbors 21
- Canals 16
- West (U.S.) 14
- Rapids 12
- United States--Armed Forces--Organization--Charts, diagrams, etc 9
- Bridges--Design and construction 6
- Government publications 4
- Stream conservation 4
- Jetties 2
- Exports 1
- Riparian areas 1
- Transportation 1