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Topic
- Scenic byways 28
- Photography 27
- Northwest, Pacific 20
- Mountains 11
- Rivers 9
- Highway engineering 8
- Tourism 8
- Tunnels 7
- Waterfalls 7
- Bridges 5
- Roads--Design and construction 5
- Riparian areas 4
- Formations (Geology) 2
- Bodies of water 1
- Maps 1
- Scenic overlooks 1
- Volcanoes 1
