This GIS map (2013), present in the Soil Atlas of Africa, contains the dominant WRB Reference Soil Group and associated qualifiers (shapefile).
European Commission, Joint Research Centre (2026): Soil Atlas of Africa and its associated Soil Map (data). [Dataset] doi: 10.2905/JRC.ZPTGEM0 PID: http://data.europa.eu/89h/jrc-esdac-91