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Browsing Environmental Science Center by Author "El Sunbel%2C Abdeul Aziz Abdull %5B%D8%B9%D8%A8%D8%AF %D8%A7%D9%84%D8%B9%D8%B2%D9%8A%D8%B2 %D8%B9%D8%A8%D8%AF %D8%A7%D9%84%D9%84%D9%87 %D8%B3%D9%86%D8%A8%D9%84%5D"