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- River engineering 142
- United States. Congress--Records and correspondence 139
- Northwest, Pacific 117
- River surveys 39
- Harbors 33
- Bodies of water 30
- Rivers 30
- Rapids 26
- River channels 23
- Canals 17
- West (U.S.) 14
- United States--Appropriations and expenditures 11
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Bridges--Design and construction 6
- Jetties 6
- Riparian areas 5
- Transportation 4
- Military maps 2
- Military topography 2
- Exports 1