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Creator
- Food and Agriculture Organization of the United Nations 13
- United Nations Development Programme 8
Topic
- Irrigation 8
- Agriculture 7
- Soils 5
- Watersheds 5
- Climate 4
- Precipitation (Meteorology) 4
- Hydrology 3
- Technology 3
- Water consumption 3
- Canals 2
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Decade
- 1970-1979 13
