Multivariate Hydrochemical Characterization and Spatial Variability of Groundwater Quality in Kano Region, Nigeria: Insights into Natural Geology and Anthropogenic Influence. International Journal of Inventive Engineering and Sciences (IJIES), [S. l.], v. 13, n. 1, p. 1–21, 2026. DOI: 10.35940/ijies.C4733.13010126. Disponível em: https://journals.blueeyesintelligence.org/index.php/ijies/article/view/983.. Acesso em: 31 jan. 2026.