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- Roads 211
- Forests and forestry 52
- Bridges 26
- Rivers--Oregon 23
- Mountains--Oregon 22
- Tunnels 15
- Perimeters (Boundaries) 9
- Signs and signboards 7
- Automobiles 6
- Coasts--Oregon 6
- Columbia River Highway (Or.) 6
- Lakes--Oregon 5
- Canyons 4
- Lumber trade 4
- Valleys 4
- Railroad tracks 3
- Roads--Design and construction 3
- Capes (Coasts) 2
- Cherry 2
- Corvallis (Or.) 2