Hussein, A., A. A. K. H., and A. AL Wassity. “Processing of Iraqi Attapulgite For Using As Drilling Muds: A Comparison Study”. Association of Arab Universities Journal of Engineering Sciences, Vol. 27, no. 4, Jan. 2021, pp. 8-16, doi:10.33261/https://doi.org/10.33261/jaaru.2020.27.4.002.