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Topic
- Bodies of water 51
- Rivers 50
- Northwest, Pacific 49
- West (U.S.) 34
- River engineering 30
- United States. Congress--Records and correspondence 30
- Transportation 26
- Water resources development 26
- Canals--Design and construction--Costs 25
- Dams--Design and construction 25
- River surveys 23
- River channels 21
- Harbors 16
- Canals 13
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Rapids 9
- Bridges--Design and construction 6
- Conservation of natural resources 2
- Fisheries 2
- Government publications 2
