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- Deserts 13
- Agriculture 8
- Irrigation 4
- Technology 4
- Climate 3
- Groundwater 3
- Politics and government 3
- Water quality 3
- Hydrology 2
- International regimes 2
- Reclamation of land 2
- Saline water conversion 2
- Saline waters 2
- Watersheds 2
- Afforestation 1
- Agriculture and state 1
- Algae 1
- Aquifers 1
- Arabah Valley (Israel and Jordan) 1
- Arid regions 1
