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- Government publications 180
- River engineering 171
- West (U.S.) 140
- Bodies of water 106
- Northwest, Pacific 102
- United States--Appropriations and expenditures 101
- River surveys 54
- Railroad engineering 49
- Canals--Design and construction--Costs 39
- Dams--Design and construction 33
- Transportation 33
- Rivers 26
- Water resources development 26
- Locks (Hydraulic engineering) 13
- Maps 6
- United States. Congress--Records and correspondence 5
- United States--Armed Forces--Organization--Charts, diagrams, etc 4
- Bridges--Design and construction 2
- Railroad construction & maintenance 2
- Cascade Range 1