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Topic
Columbia River Highway (Or.)
12
Bridges
7
Roads
6
Automobiles
3
Rivers--Oregon
3
Tunnels
3
Waterfalls
3
Columbia River Gorge (Or. and Wash.)
2
Forests and forestry
2
Gorges
2
Mountains--Oregon
2
Formations (Geology)
1
Log transportation
1
Lumber trade
1
Railroad tracks
1
Trails
1
