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- Oregon State University. Extension Service 111
- Agriculture 75
- Hops 49
- Universities and colleges--Faculty 35
- Agricultural laborers 34
- Harvesting 25
- 4-H clubs 19
- Mexican American agricultural laborers 18
- Indians of North America 14
- Oregon State Fair 14
- Barley 11
- Portraits 11
- Children 10
- Livestock 10
- Rivers--Oregon 10
- Labor camps 9
- Portraits, Group 8
- Agricultural machinery 7
- Farms 7
- Exhibitions 6
