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- United States. Congress--Records and correspondence 170
- River engineering 140
- Northwest, Pacific 133
- River surveys 43
- Harbors 33
- Bodies of water 32
- Rivers 32
- Rapids 26
- River channels 23
- Bridges--Design and construction 22
- Canals 16
- United States--Appropriations and expenditures 16
- West (U.S.) 15
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Jetties 5
- Transportation 5
- Riparian areas 4
- Agriculture 1
- Conservation of natural resources 1
- Exports 1