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- Bodies of water 112
- Bridges--Design and construction 3
- Canals--Design and construction--Costs 43
- Cascade Range 2
- Dams--Design and construction 38
- Government publications 183
- Harbors 1
- Locks (Hydraulic engineering) 15
- Maps 8
- Northwest, Pacific 106
- Railroad construction & maintenance 3
- Railroad engineering 51
- Railroads--Design and construction 1
- River engineering 176
- River surveys 57
- Rivers 30
- Transportation 37
- United States--Appropriations and expenditures 104
- United States--Armed Forces--Organization--Charts, diagrams, etc 5
- United States. Congress--Records and correspondence 6