T-S AS 154.376
Letter, first lines in a different hand, mentioning Abū Zakarīyā, Abū ʿImrān, Abū l-Ṭayyib, Saʿd b. Farrāj, Abū l-Faḍl b. ʿAlī, ʿAbdallah b. Yumr (?), Yaʿaqov b. Judah Burayh, Rabbi Joseph and Joseph b. Judah b. Joseph Burayh b. Jacob. (Information from CUDL)