الإتاحة: https://doi.org/10.17615/ce1s-kc76Testhttps://cdr.lib.unc.edu/downloads/xs55mm39r?file=thumbnailTesthttps://cdr.lib.unc.edu/downloads/xs55mm39rTest
الإتاحة: https://doi.org/10.17615/98h4-1279Testhttps://cdr.lib.unc.edu/downloads/4b29bd38d?file=thumbnailTesthttps://cdr.lib.unc.edu/downloads/4b29bd38dTest