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Topic
- Arid regions 33
- Agriculture 19
- Precipitation (Meteorology) 13
- Groundwater 12
- Irrigation 11
- Technology 9
- Watersheds 9
- Climate 7
- Rain and rainfall 6
- Droughts 5
- Hydrology 5
- Aquifers 4
- Demography 4
- Water quality 4
- Brackish waters 3
- Deserts 3
- Economics 3
- Livestock 3
- Dams 2
- Dry farming 2
