administration (1) Afrique de l'Ouest (1) végétation (1) société (humaine) (1) science (1) recherche (1) région (1) traitement (1) atmosphère (1) pays (1) environnement (1) distribution (1) couverture (1) comparaison (1) côte (1) climat (1) index (1) Afrique (1) Displacement (1) Comparison (1) Case (1) Nigeria, Western (1) Nineteen nineties (1) Nineteen eighties (1) State, The (1) Science (1) Sahel (1) Rest (1) Research (1) Rain and rainfall (1)