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OKOLI, Emeka, AKAOLISA , Casmir Chukwuemeka Zanders, UBECHU, Bridget Odochi, AGBASI, Okechukwu Ebuka and SZAFARCZYK, Anna. Using VES and GIS-Based DRASTIC Analysis to Evaluate Groundwater Aquifer Contamination Vulnerability in Owerri, Southeastern Nigeria. Ecological Questions. Online. 18 March 2024. Vol. 35, no. 3, pp. 1-27. [Accessed 16 September 2024]. DOI 10.12775/EQ.2024.031.