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Browsing Environmental Science Center by Author "Khalil%2C Galila M. %5B%D8%AC%D9%84%D9%8A%D9%84%D8%A9 %D9%85%D8%B5%D8%B7%D9%81%D9%89 %D8%AE%D9%84%D9%8A%D9%84%5D"