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Start Over You searched for: Holding Institution University of Pennsylvania ✖ Remove constraint Holding Institution: University of Pennsylvania Title Taḥrīr Uṣūl al-handasah wa-al-ḥisāb ✖ Remove constraint Title: Taḥrīr Uṣūl al-handasah wa-al-ḥisāb Author Nasir al-Din al-Tusi ✖ Remove constraint Author: Nasir al-Din al-Tusi