L. G. Hutton, Owoade, A., Moffat, W. S., and Bako, M. D.,
“Hydrogeology and water chemistry in the weathered crystalline rocks of southwestern Nigeria”, in
Groundwater management : quantity and quality : proceedings of the symposium held at Benidorm, Spain, 2-5 October 1989, 1989, pp. p. 201-214: fig., tab.
