1. Or 8587/1 Reference (shelfmark): Or 8587/1 Title: [Risālah fī al-ḥisāb] Scope & Content: Author: Azharī, Muḥammad ibn Abī Bakr Subject: Mathematics, Arab--Early works to 1800 Collection Area: Oriental Manuscripts Languages: Arabic Date Range: 17th century Extent: 1 item