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Topic
- Aquifers 65
- Demography 28
- Economics 28
- Groundwater 28
- Recycling 25
- Water consumption 23
- Water reuse 23
- Hydrology 21
- Watersheds 18
- Water quality 14
- Politics and government 9
- Agriculture 7
- Contamination of environment 7
- Irrigation 7
- Water-supply 7
- Hydrogeology 6
- Precipitation (Meteorology) 6
- Technology 5
- Climate 4
- Finance 4