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Topic
- Columbia River Highway (Or.) 14
- Roads 11
- Public sculpture 9
- Sculpture 9
- sculpture (visual work) 9
- Cliffs 6
- Rivers 4
- Bridges 3
- Columbia River Gorge (Or. and Wash.) 3
- Trees 3
- Columbia River Gorge National Scenic Area (Or. and Wash.) 2
- Forests and forestry 2
- Automobiles 1
- Canyons 1
- Columbia River Valley 1
- Mountains 1
- Valleys 1
