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Topic
- Fertility 27
- Demography 21
- Mortality 7
- Population 7
- Agriculture 6
- Health 5
- Population policy 4
- Aswan High Dam (Egypt) 2
- Census 2
- Economics 2
- Education 2
- Emigration and immigration 2
- Irrigation 2
- Soils 2
- Urbanization 2
- Watersheds 2
- Bibliography 1
- Dams 1
- Developing countries 1
- Droughts 1
