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- Pipelines 71
- Building 22
- Politics and government 18
- Finance 17
- Irrigation 16
- Water-supply 16
- Bureaucracy 15
- Economics 12
- Drinking water 8
- Technology 8
- Water consumption 7
- Water quality 6
- Agriculture 5
- Canals 5
- Saline water conversion 5
- International regimes 4
- Reservoirs 4
- Sewage 4
- Water transfer 4
- Groundwater 3
