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- Formations (Geology) 31
- Northwest, Pacific 18
- Photography 18
- Bodies of water 14
- Rivers 13
- Basalt 9
- Riparian areas 9
- Mountains 5
- Waterfalls 4
- Bridges 3
- Postcards 3
- Floods 2
- Forests and forestry 2
- Indians of North America--Funeral customs and rites 2
- Nature 2
- Railroad trains 2
- Railroads 2
- Rivers--Oregon 2
- Scenic byways 2
- Travel 2
