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YASSIN AZZI, and ALI ESSAHLAOUI, and ABDELHADI EL OUALI, and ABDELLAH EL HMAIDI, (2012) Evaluation of the Groundwater Vulnerability to the Pollution at the Middle Atlas Plateau( El Hajeb-Ifrane Region) Based on Drastic Model an GIS. Research Journal of Earth Sciences 4(1), PP. 1-4, 2012, ISSN: 1995-9044.