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- Pesticides 24
- Agriculture 11
- Agricultural experiment stations 5
- Exhibitions 3
- Oregon Museum of Science and Industry 3
- Oregon State University. Extension Service 3
- Spraying and dusting in agriculture 3
- Stores, Retail 3
- Health 2
- Irrigation 2
- Orchards 2
- Soils 2
- Agricultural laborers 1
- Agricultural machinery 1
- Algae 1
- Automobiles 1
- Blackberries 1
- Climate 1
- Contamination of environment 1
- Droughts 1