1. Sesquioxide status and particle size distribution in twelve Nigerian soils derived from sandstones;Ashaye;Afr. Soils,1969
2. Genetic evaluation of aluminum, iron and manganese oxides;Blume,1969
3. Classification of Ghanaian soils;Brammer,1962
4. A method for the determination of free iron in soils and clays;Coffin;Can. J. Soil Sci.,1963
5. Soil map of Africa;D'Hoore,1964