couverture végétale (1) vallée (1) technologie (1) science (1) recherche (1) programme (1) chêne (1) gestion (1) affectation des sols (1) paysage (1) laboratoire (1) fer (1) écosystème (1) contrat (1) climat (1) ordre (1) transhumance (1) profession (1) The Valley (1) Colonization (1) Environmental conditions (1) Agreement (1) Herding (1) Ruan (1) Environmental conditions (1) Origin (1) Water-supply (1) Transhumance (1) Technology (1) Subsidies (1)