Grace Sitohang, Sesilia, and Harapan Tua RFS. (2022) 2022. “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) 1 (2):57-64. https://doi.org/10.54443/injoss.v1i2.8.