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- Agricultural machinery 372
- Wheat--Harvesting 96
- Agricultural machinery operators 95
- Driving of horse-drawn vehicles 72
- Agriculture 66
- Agricultural laborers 39
- Harvesting 34
- Burning of land 32
- Portraits, Group 22
- Graminaceae 21
- Photography, Stereoscopic 21
- Strawberries 21
- Picketing 18
- Wheat 16
- Combines (Agricultural machinery) 15
- Croplands 13
- Horses 13
- Oregon State University. Extension Service 13
- Agricultural systems 9
- Harvesting machinery 9