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Browsing Environmental Science Center by Author "Gaffar%2C M. A %5B%D9%85%D8%AD%D9%85%D8%AF %D8%B9%D8%A8%D8%AF %D8%A7%D9%84%D8%B9%D8%B2%D9%8A%D8%B2 %D8%AC%D8%B9%D9%81%D8%B1%5D"