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Topic
- Bodies of water 247
- Ships 92
- Rivers 74
- Northwest, Pacific 63
- Docks 50
- Oregon--History 50
- Masts and rigging 46
- Photography 35
- Mooring of ships 34
- Harbors 30
- Mountains 26
- Riparian areas 26
- Steam 26
- West (U.S.) 26
- Canals--Design and construction--Costs 19
- Dams--Design and construction 19
- Transportation 19
- Water resources development 19
- Boats and boating 18
- Trees 18