Assessment of pollution in water quality of oil and grease for Tigris River-Iraq by GIS mapping (2010-2016)Ibtihal Mawlood, Abdul-Razzak Ziboon and Abdul-Hammed Al-ObaidyMATEC Web Conf., 162 (2018) 05016DOI: https://doi.org/10.1051/matecconf/201816205016