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- Agriculture 10
- Grasses--Research 8
- Universities and colleges--Faculty 6
- Civilian Conservation Corps (U.S.) 2
- Log cabins 2
- 4-H clubs 1
- Agricultural laborers 1
- Arboretums 1
- Axes 1
- Bands 1
- College presidents 1
- Competitions 1
- Flax 1
- Fort Hoskins Site (Or.) 1
- Hardware, Computer 1
- Hops 1
- KOAC (Radio station : Corvallis, Or.) 1
- Labor camps 1
- Mills and mill-work 1
- Oregon State University. Extension Service 1