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- Watersheds
- Environmental aspects 3
- Water quality 3
- Watershed management 3
- Activity programs 2
- Hydrology 2
- Management 2
- Research 2
- Study and teaching (Secondary) 2
- Water resources development 2
- Water-supply 2
- Watershed ecology 2
- Arab conflicts 1
- Case studies 1
- Effect of human beings on 1
- Environmental conditions 1
- Government policy 1
- International cooperation 1
- Israel 1
- Nature 1
- Reforestation 1
- Riparian areas 1
- Sustainable development 1
- Trees in cities 1
- Urban ecology (Sociology) 1
- Urban forestry 1
- Urbanization 1
- Water 1
- Water boundaries 1
- Water conservation 1
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