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Creator
- Food and Agriculture Organization of the United Nations 26
- United Nations Development Programme 15
Topic
- Agriculture 17
- Irrigation 13
- Watersheds 11
- Precipitation (Meteorology) 9
- Climate 8
- Hydrology 7
- Soils 6
- Water-supply 5
- Finance 4
- Groundwater 4
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Collection
- The Middle East Water Collection 26