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- Roads 90
- Forests and forestry 13
- Mountains--Oregon 7
- Tunnels 6
- Dwellings 5
- Bridges 4
- Rivers--Oregon 4
- Signs and signboards 4
- Perimeters (Boundaries) 3
- Coasts--Oregon 2
- Civilian Conservation Corps (U.S.) 1
- Coasts--California 1
- Dams 1
- Ducks 1
- Fishing 1
- Lectures and lecturing 1
- Railroad tracks 1
- Roads--Design and construction 1
- Valleys 1
- Water--Pollution 1