Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sit...

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Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sit...

Wikipedia is a Web-based, free-content encyclopedia written collaboratively by volunteers and sponsored by the non-profit Wikimedia Foundation. It con...

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Free online encyclopedia of philosophy, edited by James Fieser and Bradley Dowden. Hosted by the University of Tennessee at Martin.

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The public site for Oxford Reference Online - the biggest, most up-to-date, authoritative, and accessible reference work in the world. This huge resou...