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- Livestock 27
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- Irrigation 8
- Bureaucracy 7
- Demography 7
- Precipitation (Meteorology) 6
- Water quality 4
- Arid regions 3
- Deserts 3
- Droughts 3
- Grain 3
- Hydrology 3
- Politics and government 3
- Technology 3
- Watersheds 3
- Commerce 2
- Desertification 2
- Finance 2
- Grazing 2
