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- Government publications 184
- River engineering 177
- West (U.S.) 145
- Bodies of water 112
- Northwest, Pacific 106
- United States--Appropriations and expenditures 105
- River surveys 57
- Railroad engineering 52
- Canals--Design and construction--Costs 44
- Dams--Design and construction 38
- Transportation 37
- Rivers 30
- Water resources development 29
- Locks (Hydraulic engineering) 15
- Maps 8
- United States. Congress--Records and correspondence 6
- United States--Armed Forces--Organization--Charts, diagrams, etc 5
- Bridges--Design and construction 3
- Railroad construction & maintenance 3
- Cascade Range 2