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- Politics and government 90
- Economics 83
- Aquifers 53
- Hydrology 47
- Agriculture 44
- Demography 43
- Groundwater 34
- Water quality 33
- Resource allocation 32
- International regimes 30
- Technology 29
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- Water-supply 27
- Recycling 23
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- Armed Forces 20
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- Saline water conversion 19