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- Agricultural laborers 18
- Agriculture 7
- Agricultural machinery 5
- College students 3
- Peas 3
- Child agricultural laborers 2
- Packing-houses 2
- Threshing machines industry 2
- Threshing 2
- Wagons 2
- Women agricultural laborers 2
- Agricultural systems 1
- Alfalfa 1
- Carriages and carts 1
- Driving horses 1
- Field crops 1
- Indians of North America 1
- Oregon State University. Extension Service 1
- Tractors 1
- Trucks 1