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- Soils 11
- Agriculture 4
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- Climate 2
- Irrigation 2
- Signs and signboards 2
- Water consumption 2
- 4-H clubs 1
- Beans 1
- Bureaucracy 1
- Commerce 1
- Corn 1
- Deserts 1
- Economics 1
- Evapotranspiration 1
- Finance 1
- Geology 1
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- Groundwater 1
- Human settlements 1
