Ojo, O.T., Chiaka, I.J. and Mark, A.I. 2024. Geophysical Subsurface Mapping Using the Electrical Resistivity Technique: A Comprehensive Study of the Petroleum Training Institute Main Campus in Effurun. Indonesian Journal of Earth Sciences. 4, 1 (Feb. 2024), A846. DOI:https://doi.org/10.52562/injoes.2024.846.