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- Agriculture 11
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- Dams 8
- Thawrah (Syria) 8
- Economics 7
- Water-power 6
- Demography 5
- Precipitation (Meteorology) 4
- Water-supply 4
- Building 3
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- Economic development 3
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- Technology 3
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- Watersheds 3
- Groundwater 2
- Human settlements 2
- Migration, Internal 2
- Reclamation of land 2