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Topic
- United States. Congress--Records and correspondence 166
- River engineering 142
- Northwest, Pacific 134
- River surveys 43
- Harbors 33
- Bodies of water 30
- Rivers 30
- Rapids 26
- Bridges--Design and construction 23
- River channels 23
- Canals 17
- United States--Appropriations and expenditures 16
- West (U.S.) 14
- Government publications 10
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Transportation 7
- Jetties 6
- Riparian areas 5
- Stream conservation 4
- Exports 2
