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- Railroad tracks 48
- Rivers--Oregon 13
- Tunnels 6
- Formations (Geology) 5
- Canyons 3
- Cities and towns 3
- Forests and forestry 3
- Lumber trade 3
- Roads 3
- Basalt 2
- Evacuation of civilians 2
- Japanese Americans 2
- Jetties 2
- Mountains--Oregon 2
- Oregon State University. Extension Service 2
- Railroad cars 2
- Streets 2
- 4-H clubs 1
- Bohlman, Herman 1
- Camps 1