REVADI, C. E.; RASYIDI, M. S.; MARGARETTA, C. .; ZIKRI, K. Noise Exposure Analysis and Hearing Conservation in the CPO Industry of North Sumatra: A Case Study on Noise Mapping Techniques. Simetrikal: Journal of Engineering and Technology, v. 3, n. 1, p. 19-28, 31 Jul. 2024.