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- Trees 4
- Columbia River Gorge (Or. and Wash.) 3
- Rivers 3
- Cliffs 2
- Columbia River Highway (Or.) 2
- Columbia River 2
- Forests and forestry 2
- Landscapes 2
- Memorials--Oregon 2
- Museums 2
- Riparian areas 2
- Roads 2
- Rocks 2
- Sand bars 2
- Art nouveau (Architecture) 1
- Automobiles 1
- Stone buildings 1
- Visitors' centers--Oregon 1
- Vista House (Or.) 1
