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- Bodies of water 16
- Rivers 16
- Northwest, Pacific 15
- Photography 15
- Riparian areas 11
- Mountains 7
- Formations (Geology) 5
- Postcards 4
- Rapids 3
- Timber--Rafting 3
- Boats and boating 2
- Fishers 2
- Fishing 2
- Harbors 2
- Rafts 2
- Railroads 2
- River engineering 2
- River surveys 2
- United States. Congress--Records and correspondence 2
- Waterfalls 2