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- United States. Congress--Records and correspondence 174
- River engineering 143
- Northwest, Pacific 135
- River surveys 45
- Harbors 34
- Bodies of water 32
- Rivers 32
- Rapids 26
- Bridges--Design and construction 24
- River channels 23
- United States--Appropriations and expenditures 18
- Canals 17
- West (U.S.) 15
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Transportation 7
- Jetties 6
- Riparian areas 5
- Exports 2
- Military maps 2
- Military topography 2