1. IO Islamic 461/5 Reference (shelfmark): IO Islamic 461/5 Title: Ṭarīq fī istikhrāj khaṭṭayn bayna khaṭṭayn Scope & Content: Author: Qūhī, Wayjan ibn Rustam, -approximately 1000 VIAF ID: 29787131 Subject: Mathematics, Arab--Early works to 1800 Collection Area: Oriental Manuscripts Languages: Arabic Date Range: 17th century Extent: 1 item