Abbas, Said Hi, and Firman Firman. “ANALISIS POTENSI LOGAM TANAH JARANG ABU BATUBARA LIMBAH PLTU MULUT TAMBANG PT. WANATIARA PERSADA KAWASI OBI”. Journal Of Science and Engineering, vol. 3, no. 2, Oct. 2020, doi:10.33387/josae.v3i2.2424.