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- Watersheds 8
- Agriculture 3
- Groundwater 3
- Hydrology 3
- Bibliography 2
- Dams 2
- Demography 2
- Irrigation 2
- Animals 1
- Aquifers 1
- Bureaucracy 1
- Climate 1
- Climatic zones 1
- Ecology 1
- Economics 1
- Finance 1
- French Territory of the Afars and Issas 1
- Geomorphology 1
- History 1
- International regimes 1
