Equatorial and tropical weathering of recent basalts from Cameroon : Allophanes, halloysite, metahalloysite, kaolinite and gibbsite /Sieffermann, Gaston Millot, G. BASALTE EROSION METEORIQUE ARGILE EVOLUTION ALLOPHANE HALLOYSITE METAHALLOYSITE KAOLINITE GIBBSITE Israel Universities Press 1969 text https://www.documentation.ird.fr/hor/fdi:19330 fdi:19330 Sieffermann Gaston, Millot G.. Equatorial and tropical weathering of recent basalts from Cameroon : Allophanes, halloysite, metahalloysite, kaolinite and gibbsite. Israel Universities Press, 1969, 417-430 International Clay Conference, Tokyo (JAP), 1969 EN CAMEROUN