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Browsing Environmental Science Center by Author "Abdel Bar%2C Amr Hussein %5B%D8%B9%D9%85%D8%B1%D9%88 %D8%AD%D8%B3%D9%8A%D9%86 %D8%B9%D8%A8%D8%AF %D8%A7%D9%84%D8%A8%D8%B1%5D"