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An appraisal of Subsurface Geology and Groundwater Resources of Owerri and Environs Based on Electrical Resistivity Survey and Borehole Data Evaluation 基於電阻觀察和鑛井?dāng)?shù)據(jù)評價(jià),對水麪下層地質(zhì)與地下水資源的評價(jià)