1. The geology of parts of Adamawa, Bauchi and Bornu provinces in northeastern Nigeria;Carter;Geol. Surv. Nigeria, Bull.,1963
2. The clay mineralogy of some soils from northern Borneo considered in relation to their origin and their properties as road making materials;Dumbleton;Brit. Road Res. Lab. Note,1963
3. Origin classification and distribution of Nigerian laterites;Du Preez,1956
4. Quaternary sediments in Nigeria;Durotoye,1975
5. Quantitative estimations of clay minerals by diffraction methods;John;J. Sediment. Petrol.,1954