الإتاحة: https://doi.org/10.17615/wyjb-q297Testhttps://cdr.lib.unc.edu/downloads/qb98mn50p?file=thumbnailTesthttps://cdr.lib.unc.edu/downloads/qb98mn50pTest
الإتاحة: https://doi.org/10.17615/3yv9-0837Testhttps://cdr.lib.unc.edu/downloads/0c483s87d?file=thumbnailTesthttps://cdr.lib.unc.edu/downloads/0c483s87dTest
الإتاحة: https://doi.org/10.17615/pe0q-mf10Testhttps://cdr.lib.unc.edu/downloads/44558m206?file=thumbnailTesthttps://cdr.lib.unc.edu/downloads/44558m206Test