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Tesfahun Sisay, Mehari, B.M. and Dereje Yenealem 2024. Elemental and Polyphenol Contents of Green Coffee Beans from Central Gondar Zone, Ethiopia. Ethiopian Journal of Natural and Computational Sciences . 3, 2 (May 2024), 443–452. DOI:https://doi.org/10.20372/ejncs.v3i2.778.