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- Architecture, American 78
- Architecture--United States 78
- Agriculture 32
- Farm ownership 18
- Farm tenancy--Economic aspects 18
- Oregon State University. Extension Service 13
- Farms--Oregon 12
- Lichens 12
- Harvesting 10
- Potatoes 7
- Ranches--Oregon 7
- Mexican American agricultural laborers 6
- Forests and forestry 5
- Indians of North America 5
- Fishing 4
- Roads 4
- Agricultural laborers 3
- Irrigation canals and flumes 3
- Lakes--Oregon 3
- Mountains--Oregon 3
