1. University of Pennsylvania, LJS 407 DS ID: DS654 Title: Astronomical texts Author: Nasir al-Din al-Tusi Date: [between 1500 and 1599?]
2. Columbia University Rare Book & Manuscript Library, MS Or 11 DS ID: DS6598 Title: Sī faṣl Author: Nasir al-Din al-Tusi Date: 16--?-17--?