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تصفح Chemistry & Earth Sciences حسب المؤلف "Heiba%2C H. I. %5B%D8%AD%D9%84%D9%85%D9%8A %D8%A7%D8%B3%D9%85%D8%A7%D8%B9%D9%8A%D9%84 %D9%87%D9%8A%D8%A8%D8%A9%5D"