Al-Mallah, S., سحر, Buker, R. and رجب 2005. NATURAL MINERAL CLYS BEARING FELDSPAR,PYSICAL AND STRUCTURAL STUDIES AND APPLICATION IN PERTOLEUM FRACTIONATION. Journal of Education and Science (JES). 17, 4 (Sep. 2005), 42–53. DOI:https://doi.org/10.33899/edusj.2005.83069.