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Abdou, H., Léopold, E.N., Malloum, M.S.A. and Bitom, D. 2023. Assessment of Heavy Metal Contamination Levels in Market Gardening Soils Used to Grow Onions (Allium Cepa) in the City of Abéché (Eastern Chad). International Journal of Applied Sciences and Biotechnology. 11, 1 (Mar. 2023), 42–53. DOI:https://doi.org/10.3126/ijasbt.v11i1.53700.