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- Forest ecology
- Forest management 17
- Forests and forestry 14
- Environmental aspects 7
- Forest conservation 7
- Forest policy 6
- Ecology 5
- Forest plants 5
- Trees 4
- Biodiversity conservation 3
- Forest reserves 3
- History 3
- Sustainable forestry 3
- Air 2
- Clearcutting 2
- Community forests 2
- Conservation 2
- Deforestation 2
- Ecological disturbances 2
- Ecosystem management 2
- Effect of human beings on 2
- Environmental conditions 2
- Forest biodiversity 2
- Management 2
- Natural history 2
- Nature 2
- Pollution 2
- Social aspects 2
- Soils 2
- Adaptation 1
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