ZAIA, Y.Y., ADAM, S.M. and GILYANA, S.M. 2017. A COMPARISON OF RTK-GPS VERTICAL COMPONENT WITH PRECISE DIGITAL LEVEL FOR ESTIMATING VOLUMES. Journal of Duhok University. 20, 1 (Jul. 2017), 374-380. DOI:https://doi.org/10.26682/sjuod.2017.20.1.34.