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Start Over You searched for: Material Paper ✖ Remove constraint Material: Paper Keywords Nīsābūrī, Niẓām al-Dīn al-Ḥasan ibn Muḥammad, -1328 or 1329. Risālah al-Shamsīyah fī al-ḥisāb ✖ Remove constraint Keywords: Nīsābūrī, Niẓām al-Dīn al-Ḥasan ibn Muḥammad, -1328 or 1329. Risālah al-Shamsīyah fī al-ḥisāb Dated Dated ✖ Remove constraint Dated: Dated