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Spatio-Temporal Characterization and Acoustic Mapping of Ambient Noise Levels at Ogbonnaya Onu Polytechnic, Aba, Nigeria: A Multi-Source Compliance Analysis. CEMRJ [Internet]. 2026 Jul. 28 [cited 2026 Aug. 8];4(5):764-80. Available from: https://cemrj.com/index.php/volumes/article/view/247