Take a look at these databases of encyclopedias, dictionaries, companions, and guides to find general overviews, quick facts, dates, and events, and sources for further study.
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Cambridge Companions contains full text books and chapter extracts. It includes Cambridge Companions in Literature and Classics; the Cambridge Companions in Philosophy, Religion and Culture; and the Companions in Music.
Oxford English Dictionary (OED), published by the Oxford University Press, is a descriptive dictionary of the English language. Included is the complete text of the 2nd. ed. of the Oxford English dictionary with quarterly updates, including revisions not available in any other form.