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Browsing Environmental Science Center by Author "Awad%2C Ibrahim M. A. %5B%D8%A7%D8%A8%D8%B1%D8%A7%D9%87%D9%8A%D9%85 %D9%85%D8%AD%D9%85%D8%AF %D8%B9%D9%84%D9%8A %D8%B9%D9%88%D8%B6%5D"