“Adsorption and Thermodynamic Study of Direct Blue 71 Dye on to Natural Flint Clay from Aqueous Solution ”. Baghdad Science Journal 13, no. 2.2NCC (June 5, 2016): 0066. Accessed July 1, 2026. https://bsj-ojs.uobaghdad.edu.iq/index.php/BSJ/article/view/2753.