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- p01 - conservation de la nature et ressources foncieres10
- k01 - foresterie - considerations generales7
- k10 - production forestiere6
- ecosystem services5
- [sde.be] environmental sciences/biodiversity and ecology4
- [sde.be]environmental sciences/biodiversity and ecology4
- fuelwood4
- chloroplasts3
- e51 - population rurale3