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- Kelps 9
- Puget Sound (Wash.) 9
- River engineering 7
- United States--Appropriations and expenditures 7
- River surveys 5
- Government publications 3
- Bodies of water 2
- Canals--Design and construction--Costs 2
- Dams--Design and construction 2
- Locks (Hydraulic engineering) 2
- Railroad engineering 2
- West (U.S.) 2
- Cascade Range 1
- Transportation 1
