Olayinka, A.I. A geoelectrical-hydrogeochemical investigation of shallow groundwater occurrence in Ibadan, southwestern Nigeria - Berlin Springer Verlag January 1999 - pp. 31-39 ilus., maps. ISSN: 0943-0105 Subjects--Topical Terms: AGUAS SUBTERRANEASHIDROGEOQUIMICAPROSPECCION ELECTRICARESISTIVIDAD ELECTRICA Subjects--Geographic Terms: IBADANNIGERIA