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Topic
- Bodies of water 38
- Northwest, Pacific 38
- Riparian areas 38
- Rivers 38
- Photography 37
- Mountains 20
- Formations (Geology) 9
- Postcards 6
- Steamboats 5
- Railroads 4
- Rapids 4
- Fishers 3
- Boats and boating 2
- Bridges 2
- Cliffs 2
- Floods 2
- Ice on rivers, lakes, etc 2
- Indians of North America 2
- Locks (Hydraulic engineering) 2
- Scenic byways 2