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