Searchable Online Version Ṣiddīq Ḥasan Khān, Abjad al-ʿUlūm أبجد العلوم لصديق حسن خان

Abjad al-ʿUlūm is a 600-page encyclopedia of the sciences, especially the Islamic ones, by the Indian Islamic scholar Ṣiddīq Ḥasan Khān (d. 1890 CE). The book relies on al-Fārābī's Iḥsāʾ al-ʿUlūm (d. 950 CE), al-Khawārizmi's Mafātīḥ al-ʿUlūm (d. 847 CE), Tashkubrī Zādeh's Miftāḥ al-Saʿāda (d. 1561 CE) and Ḥājī Khalīfa's Kashf al-Ẓunūn (d. 1657 CE), the latter two sources being Ottoman scholarly works.