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Donor
- Naff, Thomas 7
Topic
- Watersheds 7
- Soils 4
- Precipitation (Meteorology) 3
- Agriculture 2
- Groundwater 2
- Hydrology 2
- Animals 1
- Aquifers 1
- Canals 1
- Climate 1
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Region
- Sudan 7
- Egypt 2
- Ethiopia 2
- South Sudan 1
Decade
- 1970-1979 7