Butar Butar, A., Ikhsan, A., Razak, A., Handayuni, L., & Yuniarti, E. (2023). Identification of Hazardous and Toxic Waste Characterization in the Mining Activities of PT Semen Padang. Science and Environmental Journal for Postgraduate, 5(2), 105-110. https://doi.org/10.24036/senjop.v5i2.161