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- Irrigation 4
- Politics and government 2
- Agriculture 1
- Comparative Arid Lands Agriculture Research Program 1
- Cooperative societies 1
- Deserts 1
- Groundwater 1
- Health 1
- Hydrology 1
- International regimes 1
- Runoff 1
- Saline waters 1
- Sewage--Purification 1
- Technology 1
- Toxicology 1
- Water balance (Hydrology) 1
- Water consumption 1
- Water quality 1
- Water transfer 1
- Water-supply 1