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- Deserts 7
- Agriculture 6
- Reclamation of land 5
- Bureaucracy 3
- Demography 2
- Irrigation 2
- Watersheds 2
- Agriculture and state 1
- Bedouins 1
- Building 1
- Commerce 1
- Cooperative societies 1
- Exports 1
- Grazing 1
- Human settlements 1
- Imports 1
- International regimes 1
- Livestock 1
- Minerals 1
- Politics and government 1
