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- River surveys 35
- River engineering 33
- United States. Congress--Records and correspondence 31
- Bodies of water 29
- Rivers 29
- Harbors 22
- River channels 21
- Northwest, Pacific 16
- West (U.S.) 14
- Canals 12
- Rapids 12
- United States--Armed Forces--Organization--Charts, diagrams, etc 9
- Bridges--Design and construction 6
- United States--Appropriations and expenditures 5
- Riparian areas 2
- Conservation of natural resources 1
- Exports 1
- Government publications 1
- Industrialization 1
- Jetties 1