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- Agricultural machinery 52
- Agricultural machinery operators 25
- Wheat--Harvesting 25
- Driving of horse-drawn vehicles 13
- Wheat 6
- Agriculture 3
- Combines (Agricultural machinery) 3
- Harrows 3
- Haying equipment 3
- Cultivators 2
- Oregon State University. Extension Service 2
- Portraits, Group 2
- College buildings 1
- Farm tractors 1
- Forestry Building 1
- Harvesting machinery 1
- Harvesting 1
- Horse-drawn vehicles 1
- Langton Hall 1
- Men's Gymnasium 1