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Browsing Environmental Science Center by Author "Helmy%2C Ahlam M. A. %5B%D8%A7%D8%AD%D9%84%D8%A7%D9%85 %D8%B9%D8%A8%D8%A7%D8%B3 %D8%AD%D9%84%D9%85%D9%8A%5D"