1. University of Pennsylvania, LJS 286 DS ID: DS604 Title: Taḥrīr Uṣūl al-handasah wa-al-ḥisāb. Author: Nasir al-Din al-Tusi Date: A.H. 890 (1485)
2. Columbia University Rare Book & Manuscript Library, MS Or 10 DS ID: DS6597 Title: Bīst dar maʻrifat-i usṭurlāb Author: Nasir al-Din al-Tusi Place: Iran Date: 1299.