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Encyclopaedia Britannica

Encyclopaedia Britannica is a general encyclopedia that has been published since the 18th century. The current edition is published online at Britannica.com, and has a mix of ad-supported free content and subscription-based content.

Bibliographic notes

Encyclopaedia Britannica had 15 print editions. There were also various unauthorized editions published in the US (which did not have copyright relations with the UK when the first 10 official editions were published). Editions after the 12th remain copyrighted in the US. The current edition is electronic-only.

See also
 
3rd edition (1797) 4th edition (1810) 6th edition (1823) 11th edition (1911)

This edition, the last complete revision currently in the public domain, is a favorite for reprints and online editions.

Editions in libraries

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