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2. Notes on the occurrence of oolites and pisolites in the Nigerian laterites;du Preez,1952
3. Laterite - A general occurrence with a description of Nigerian occurrences;du Preez;Bull. Agric. Congo Belge,1954
4. Slope development and soil morphology in a part of South-west Nigeria;Moss;J. Soil Sci.,1965
5. Mineralogy and geochemistry of laterites of Southeastern Nigeria;Oti,1987