GRACE SITOHANG, S. .; RFS , H. T. SUPERVISION OF ENVIRONMENTAL POLLUTION BY THE ENVIRONMENTAL AGENCY OF SIAK REGENCY (CASE STUDY OF PT. INDAH KIAT PULP & PAPER TBK PERAWANG). International Journal Of Humanities, Social Sciences And Business (INJOSS), [S. l.], v. 1, n. 2, p. 57–64, 2022. Disponível em: https://www.injoss.socian.my.id/index.php/joss/article/view/8. Acesso em: 19 mar. 2026.