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Topic
- Watersheds 25
- Groundwater 13
- Irrigation 10
- Agriculture 9
- Hydrology 9
- Soils 7
- Dams 6
- Climate 4
- Precipitation (Meteorology) 4
- Aquifers 3
- Desertification 3
- Aswan High Dam (Egypt) 2
- Bibliography 2
- Demography 2
- Drainage 2
- Droughts 2
- Ecology 2
- Economics 2
- Erosion 2
- Finance 2
