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Browsing Environmental Science Center by Author "El Dairy%2C M. D. %5B%D9%85%D9%85%D8%AF%D9%88%D8%AD %D8%AF%D8%B1%D9%88%D9%8A%D8%B4 %D8%A7%D9%84%D8%AF%D9%8A%D8%B1%D9%8A%5D"