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- River channels 31
- River engineering 27
- Rivers 25
- Bodies of water 23
- United States. Congress--Records and correspondence 23
- River surveys 22
- Northwest, Pacific 17
- Harbors 14
- Canals 13
- Rapids 10
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- West (U.S.) 10
- Bridges--Design and construction 6
- Jetties 4
- Politics and government 3
- Engineering--Estimates 2
- International law 2
- Photography 2
- Piling (Civil engineering) 2
- Railroads 2