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Akinbola, G., M. Adigun, and O. Aduroja. “Dithionite and Oxalate Extraction of Iron and Manganese in Some Basement Complex Soils of Southwestern Nigeria”. Journal of Experimental Sciences, vol. 4, no. 2, July 2013, pp. 22-26, https://www.updatepublishing.com/journal/index.php/jes/article/view/1977.