1. 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.
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--?