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Three works in one volume: A. Abu'l-Fada'il 'Izz al-Din 'Abd al-Aziz ibn Muhammad Wafa'i (d. AD 1469), mu'adhdhin and timekeeper of the Umayyad mosque in Cairo, al-Nujum al-zahirat fi'l–'amal bi rub'al-muqantarat, Brilliant Stars on Operations with the Almucantar Quadrant probably Egypt or Syria, 16th Century
and B. Abu Zayd 'Abd al-Rahman ibn Muhammad ibn Ahmad al-Tarabulusi al-Tajuri (d. AD 1552), Risalah fi'l-'amal bi'l-rub' al-muqantarat, treatise on the Operations of the Almucantar Quadrant; and C. Jamal al-Din 'Abdallah ibn Khalil ibn Yusuf al-Mardini (d. AD 1406), Risalah fi'l-'amal bi'l-rub' al-mujayyab, treatise on Operations with the Sine Quadrant, Arabic manuscript on paper, 54 leaves, first treatise incomplete at beginning, approximately 19-21 lines to the page written in a cursive script and small nasta'liq script in black ink, significant words picked out in red ink, second treatise with some diagrams and tables, edges frayed and browned, discoloration, later green cotton binding faded and stained, small tears 185 x 140 mm.