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Topic
- Bodies of water 20
- West (U.S.) 16
- Rivers 15
- Canals--Design and construction--Costs 14
- Dams--Design and construction 14
- Transportation 14
- Northwest, Pacific 13
- Water resources development 13
- Boats and boating 3
- Buildings 2
- Inland navigation 2
- Mooring of ships 2
- Nets 2
- Oregon--History 2
- River surveys 2
- Ships 2
- Signs and signboards 2
- Steamboats 2
- Wharves 2
- Boatbuilding 1