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Browsing Environmental Science Center by Author "Abdel Khalek%2C Ahmed M. %5B%D8%A7%D8%AD%D9%85%D8%AF %D8%B9%D8%A8%D8%AF %D8%A7%D9%84%D8%AE%D8%A7%D9%84%D9%82%5D"