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- Waterfalls--Oregon 16
- Multnomah Falls (Or.) 8
- Trees 6
- Bridges 4
- Columbia River Gorge National Scenic Area (Or. and Wash.) 3
- Railroad trains 3
- Tourists 3
- Columbia River Gorge (Or. and Wash.) 2
- Columbia River Highway (Or.) 2
- Park lodging facilities 2
- Rocks 2
- Waterfalls 2
- Automobiles 1
- Cannon Beach (Or.) 1
- Caves--Oregon 1
- Cliffs 1
- Columbia River Watershed 1
- Mountains 1
- Parks--Public use 1
- Passenger trains 1