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Creator
- Food and Agriculture Organization of the United Nations 2
- United Nations Development Programme 2
Topic
- Dams 2
- Aquifers 1
- Barrages 1
- Canals 1
- Groundwater 1
- Hydrology 1
- Irrigation 1
- Political geography 1
- Precipitation (Meteorology) 1
- Technology 1
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Decade
- 1970-1979 2
