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- Contamination of environment 16
- Water quality 16
- Irrigation 4
- Sewage 4
- Finance 3
- Health 3
- Bureaucracy 2
- Desertification 2
- Drinking water 2
- Economics 2
- Refuse and refuse disposal 2
- Water--Purification 2
- Algae 1
- Arab League Educational, Cultural, and Scientific Organization 1
- Atomic absorption spectroscopy 1
- Building 1
- Dams 1
- Deforestation 1
- Demography 1
- Drainage 1