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Browsing Environmental Science Center by Author "El sharaky%2C A. S. %5B%D8%A7%D8%AD%D9%85%D8%AF %D8%B5%D8%A8%D8%AD%D9%8A %D8%A7%D9%84%D8%B4%D8%B1%D8%A7%D9%83%D9%8A%5D"