Encyclopaedia of Islam
http://www.brillonline.nl/

Contains articles on distinguished Muslims of every era and origin, on tribes and dynasties, on crafts and sciences, on political and religious institutions, on the geography, ethnography, flora and fauna of the various countries and on the history, topography and monuments of the major towns and cities. In its geographical and historical scope it encompasses the old Arabo-Islamic empire, the Islamic countries of Iran, Central Asia, the Indian sub-continent and Indonesia, as well as the Ottoman Empire and all other Islamic countries.