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  • geol.sci.sohag-univ.edu.eg/2021/02/10/%D9%83%D9%84%D9%85%D8%A9-%D8%B1%D8%A6%D9%8A%D8%B3-%D8%A7%D9%84%D9%82%D8%B3%D9%85/ (port 80)