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Topic
- Groundwater 27
- Irrigation 11
- Wells 10
- Agriculture 9
- Bureaucracy 8
- Water quality 8
- Hydrology 6
- Water-supply 6
- Technology 5
- Demography 4
- Politics and government 4
- Aquifers 3
- Dams 3
- Watersheds 3
- Arid regions 2
- Droughts 2
- Reclamation of land 2
- Reservoirs 2
- Sinai (Egypt) 2
- Water-power 2
