Title: al-Mulakhkhaṣ min kitāb al-Farq bayna al-Sīn wa-al-Ṣād li-Abī al-Ḥasan Muḥammad ibn Kaysān al-Naḥwī, al-mutawafá sanat 320 H
Subjects: Sīn (The Arabic letter), Ṣād (The Arabic letter), Arabic alphabet
People: Muḥammad ibn Aḥmad Ibn Kaysān