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- Waterfalls 25
- Bridges 17
- Multnomah Falls (Or.) 16
- Photography 10
- Northwest, Pacific 8
- Trees 8
- Rivers 7
- Nature 6
- Bodies of water 5
- Rocks 5
- Tourists 5
- Waterfalls--Oregon 5
- Automobiles 3
- Columbia River Highway (Or.) 3
- Forests and forestry 3
- Formations (Geology) 3
- Mountains 3
- Railroad trains 3
- Columbia River Valley 2
- Columbia River 2
