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Browsing Environmental Science Center by Author "Abdel Maksoud%2C M. A. %5B%D9%85%D8%AD%D9%85%D8%AF %D8%B9%D9%84%D9%8A %D8%B9%D8%A8%D8%AF%D8%A7%D9%84%D9%85%D9%82%D8%B5%D9%88%D8%AF%5D"