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Reference Resources
Reference Works | Brill
18 OA reference titles (as of Nov. 2021).
In total, Brill today publishes more than 360 journals and 2,000 new books and reference works each year as well as a large number of databases and primary source research collections.
Reference Extracts | OUP
Oxford University Press publishes many valuable reference resources. The overwhelming majority of the content is behind a paywall (libraries usually subscribe), however this list of OA entries from various OUP titles might prove to be useful in and of itself, but it could also lead researchers to a dictionary or encyclopedia that will fill an information gap.
General encyclopedic works - World Digital Library
With a total of 96 digitized books (as of Nov.2021), this collection includes all 86 volumes of the Brockhaus and Efron Encyclopedic Dictionary (Entsiklopedicheskii Slovar'), published in Saint Petersburg, Russia, in 1890–1907 and Muḥyiddin ibn Arabi's Al-Futuhat al-Makkiyya (The Meccan revelations)