MUSTAFA, W.S., NAJMADDIN, D.Y., HASSAN, H.J.A. and ARBILI, M.M. 2019. EFFECT THE SHAPE OF GRAVEL ON IMPROVING CBR AND COMPACTION BEHAVIOUR OF CLAYEY SOIL. Journal of Duhok University. 21, 2 (Jul. 2019), 154-164. DOI:https://doi.org/10.26682/sjuod.2018.21.2.12.