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Topic
- Automobiles 1
- Basalt 2
- Bodies of water 3
- Bridges 2
- Canyons 4
- Cliffs 5
- College students 1
- Columbia River Gorge (Or. and Wash.) 1
- Columbia River Gorge National Scenic Area (Or. and Wash.) 1
- Columbia River Highway (Or.) 3
- Electric lines--Poles and towers 1
- Formations (Geology) 5
- Gorges 4
- Highway engineering 2
- History 2
- Landscapes 1
- Maps 1
- Mountains 3
- Nature 4
- Northwest, Pacific 7
