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- Roads 525
- Rivers 142
- Automobiles 101
- Bridges 90
- Trees 84
- Buildings 81
- Mountains 69
- Columbia River Highway (Or.) 57
- Cliffs 50
- Forest roads 48
- Forests and forestry 45
- Landscapes 42
- Dirt roads 35
- Cities and towns 31
- Aerial photography 29
- Tunnels 26
- Columbia River Gorge (Or. and Wash.) 22
- Rocks 20
- Columbia River 18
- Electric lines 16