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Topic
- Reclamation of land 60
- Agriculture 42
- Irrigation 26
- Bureaucracy 22
- Deserts 11
- Finance 10
- Groundwater 9
- Dams 7
- Demography 7
- Drainage 7
- Watersheds 7
- Economics 6
- Thawrah (Syria) 5
- Water consumption 5
- Water quality 5
- Building 4
- Climate 4
- Soils 4
- Technology 4
- Canals 3