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Ressource en sol --- Soil resources --- Dégradation du sol --- Soil degradation --- Écologie --- ecology --- Gestion des ressources --- resource management --- Sciences du sol --- Soil sciences --- Agriculture --- agriculture --- Impact sur l'environnement --- Environmental impact --- Besoin d'information --- information needs --- Système d'information --- information systems --- Amérique du Nord --- North America --- Land use --- Soil and civilization. --- Soil management --- Environmental Sciences and Forestry. Soil Science --- History. --- Soil Science (General) --- Soil Science (General). --- agriculture. --- History