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- Climate 182
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- Agriculture 57
- Watersheds 57
- Hydrology 53
- Irrigation 49
- Economics 37
- Groundwater 36
- Demography 31
- Water quality 29
- Politics and government 25
- Technology 25
- Rain and rainfall 20
- Water-supply 20
- Population 19
- Droughts 18
- Soils 18
- Water consumption 13
- Water-power 12
- Aquifers 10