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- Agriculture 112
- Irrigation 65
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- Economics 30
- Bureaucracy 29
- Hydrology 18
- Building 17
- Dams 17
- Demography 13
- Groundwater 13
- Water quality 11
- Watersheds 11
- Industries 9
- Reclamation of land 9
- Canals 8
- Finance 8
- Hussein, Saddam, 1937-2006 8
- Precipitation (Meteorology) 8
- Technology 7
- Water-power 7