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- Agriculture 18
- Universities and colleges--Faculty 10
- Grasses--Research 8
- Oregon State University. Extension Service 7
- Forests and forestry 6
- Agricultural laborers 5
- Civilian Conservation Corps (U.S.) 4
- Flax 4
- Portraits, Group 4
- Bands 3
- Bicycles 3
- College students 3
- Signs and signboards 3
- 4-H clubs 2
- Aerial views 2
- Buildings 2
- Carriage and wagon making 2
- Crowds 2
- Factories 2
- Hearing clinics 2