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- Irrigation 5
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- Demography 3
- Technology 3
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- Politics and government 2
- Resource allocation 2
- Saline water conversion 2
- Water-power 2
- Water-supply 2
- Aquifers 1
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- Hydrology 1
- Imports 1
- Nasser, Lake (Egypt and Sudan) 1
- Palestinian Arabs 1
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