@ARTICLE {JUO:1974a, title = {Forms and pedogenetic distribution of extractable iron and aluminum in selected soils of Nigeria}, author = {Juo, A. S. R. and Moormann, F. R. and Maduakor, H. O. }, journal = {Geoderma}, year = {1974}, volume = {11}, number = {3}, pages = {167--179}, issn = {0016-7061}, doi = {10.1016/0016-7061(74)90015-9}, }