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- Agriculture 47
- Oregon State University. Extension Service 47
- Agricultural laborers 30
- Harvesting 24
- Hops 20
- Mexican American agricultural laborers 13
- Labor camps 9
- Agricultural machinery 6
- Prisoners of war 6
- Beans 5
- Potatoes 5
- 4-H clubs 4
- Housing 4
- Onions 4
- Universities and colleges--Faculty 4
- Flax 3
- Harvesting machinery 3
- Japanese Americans 3
- Lakes--Oregon 3
- Oregon State Fair 3