Al-Tayyar, T. and mohsin Shihab, A. 2005. Seasonal variations in some elements of the quality of the Tigris waters between Qaber Abd and al-Qayara. Journal of Education and Science (JES). 17, 1 (Jan. 2005), 29–39. DOI:https://doi.org/10.33899/edusj.2005.80877.