1. Columbia University Rare Book & Manuscript Library, MS Or 25 Title: De sphaericis Author: Theodosius of Bithynia Place: India Date: between 1850 and 1899?
2. Columbia University Rare Book & Manuscript Library, MS Or 287 Title: De sphaericis Author: Theodosius of Bithynia Place: Tabriz Date: 1895.
3. Columbia University Rare Book & Manuscript Library, MS Or 28 Title: De sphaericis Author: Theodosius of Bithynia Place: 18-- Date: 1800-1899