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Topic
- Agriculture 36
- Technology 32
- Groundwater 29
- Irrigation 26
- Water quality 25
- Economics 19
- Water consumption 19
- Watersheds 15
- Politics and government 13
- Hydrology 12
- Tiberias (Israel) 12
- Water-supply 12
- Bureaucracy 11
- Saline water conversion 11
- Aquifers 10
- Sewage--Purification 10
- Gush Dan (Israel) 7
- Sewage 7
- Demography 6
- Human settlements 5
