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Start Over You searched for: 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 Former Owner Lawrence J. Schoenberg ✖ Remove constraint Former Owner: Lawrence J. Schoenberg