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- Waterfalls 23
- Multnomah Falls (Or.) 18
- Footbridges 9
- Bridges 5
- Columbia River Highway (Or.) 3
- Rivers--Oregon 2
- Automobiles 1
- Basalt 1
- College students 1
- Columbia River Gorge (Or. and Wash.) 1
- Dams 1
- Dippers (Birds) 1
- Fishing 1
- Formations (Geology) 1
- Indians of North America 1
- Murres 1
- Puffins 1
- Roads 1
- Salmon 1
- Sea Lion Caves (Or.) 1
