SAIMA MALIK; DR. TAJNEES PIRZADA; SANA MALIK. EXTRACTION OF THE HUMIC ACID FROM THAR LIGNITE COAL BY USING DIFFERENT SOLUTIONS. Policy Journal of Social Science Review, [S. l.], v. 3, n. 9, p. 487–493, 2025. Disponível em: https://policyjssr.com/index.php/PJSSR/article/view/927. Acesso em: 5 may. 2026.