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Topic
- Northwest, Pacific 6
- Roads--Design and construction 6
- Scenic byways 5
- Photography 4
- Bridges 2
- Waterfalls 2
- Formations (Geology) 1
- Tunnels 1
Region
- Oregon >> United States 6
- Washington >> United States 5
- Celilo Falls (historical) >> Wasco County >> Oregon >> United States 2
- Columbia River >> Douglas County >> Washington >> United States 2
- Latourell Falls >> Multnomah County >> Oregon >> United States 2
- Oneonta Gorge >> Multnomah County >> Oregon >> United States 1
Type
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Institution
- University of Oregon 6