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Topic
- Building 73
- Finance 42
- Sewage 12
- Water quality 12
- Investments, Foreign 11
- United States. Agency for International Development 11
- Bureaucracy 9
- Dams 8
- Sewage--Purification 8
- Irrigation 7
- Water-power 7
- Economics 6
- Hydrology 6
- Technology 6
- World Bank 6
- Aswan High Dam (Egypt) 5
- Saline water conversion 5
- Agriculture 4
- Canals 4
- Demography 4