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Topic
- River surveys 43
- United States. Congress--Records and correspondence 41
- River engineering 39
- Bodies of water 28
- Rivers 28
- River channels 22
- Harbors 21
- Northwest, Pacific 15
- United States--Appropriations and expenditures 14
- West (U.S.) 14
- Canals 13
- Rapids 13
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Bridges--Design and construction 6
- Transportation 5
- Exports 1
- Jetties 1
- Military maps 1
- Military topography 1
- Riparian areas 1