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- Scenic byways 36
- Photography 33
- Northwest, Pacific 27
- Mountains 13
- Rivers 11
- Highway engineering 8
- Tourism 8
- Tunnels 7
- Waterfalls 7
- Bridges 5
- Nature 5
- Riparian areas 5
- Roads--Design and construction 5
- Travel 5
- Bodies of water 3
- Formations (Geology) 2
- Forests and forestry 1
- Maps 1
- Mount Hood Loop Highway (Or.) 1
- Roads 1