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Iyi, Emmanuel Chibuike and Okoro, Joel Ejiofor 2026. HYDROGEOCHEMICAL CHARACTERIZATION ASSESSMENT OF GROUNDWATER WITHIN IMICHAEL OKPARA UNIVERSITY OF AGRICULTURE AND ENVIRONS, UMUDIKE SOUTHEASTERN NIGERIA. International Journal of Earth & Environmental Sciences (IJEES). 11, 1 (Sep. 2026), 134–157. DOI:https://doi.org/10.58885/ijees.v11i1.134.iech.