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Creator
- Egypt. Wizārat al-Rayy 8
Topic
- Agriculture 5
- Irrigation 4
- Groundwater 3
- Hydrology 3
- Industries 3
- Sewage 3
- Water quality 3
- Drainage 2
- Water-power 2
- Water-supply 2
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Publisher
- World Bank 8
- United Nations Development Programme 5
- United Nations Environment Programme 2
Institution
- Oregon State University 8