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Browsing Environmental Science Center by Author "Mahran%2C Tawfiq M. %5B%D8%AA%D9%88%D9%81%D9%8A%D9%82 %D9%85%D8%AD%D9%85%D8%AF %D9%85%D9%87%D8%B1%D8%A7%D9%86%5D"