Otitigbe, FE. “Investigating Nigeria Local Clay for Its Marsh Funnel Viscosity and Gel Strength: A Study of Irhodo Bentonite”. NIGERIAN ANNALS OF PURE AND APPLIED SCIENCES 4, no. 1 (November 15, 2021): 242–249. Accessed April 10, 2025. https://mail.napas.org.ng/index.php/napas/article/view/93.