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- Oranges 8
- Agriculture 3
- Orchards 3
- Oregon State University. Extension Service 2
- Crops 1
- Crops--Effect of air pollution on 1
- Farmhouses 1
- Fruit trees 1
- Historic agricultural landscapes 1
- Historic rural landscapes 1
- Mountains 1
- Orange industry 1
- Packing-houses 1
- Palms 1
- Riverside County (Calif.) 1
- Trees 1
