WITNESS

Taḥrīr Uṣūl al-handasah li-Uqlīdis (Ṭūsī)_St. Petersburg_State University of St. Petersburg Library_Oriental Dept (State Univ. St. Petersburg)_90

References

Frolova, O.B. 1996. Arabskie Rukopisi Vostochnogo Otdela Nauchnoĭ Biblioteki Sankt-Peterburgskogo Gosudarstvennogo Universiteta. Kratkiĭ Katalog (Arabic Mms Of The Oriental Depart Of The Scholarly Library Of The State Univ. Of St. Petersburg: A Concise Catalogue). St. Petersburg.

P. 27, no. 68. See also p. 171, no. 871.