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Browsing Environmental Science Center by Author "El Bayoumi%2C A. S. %5B%D8%B9%D8%A8%D8%AF %D8%A7%D9%84%D8%B9%D8%B2%D9%8A%D8%B2 %D8%A7%D9%84%D8%A8%D9%8A%D9%88%D9%85%D9%8A%5D"