Encyberpedia Electronic encyclopedia with its own content as well as over 10,000 links to the best reference sites on the Internet.
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Encyclopaedia Britannica Online Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Full text for subscribers only; free trial available.
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Encyclopedia Smithsonian Links to on-line Smithsonian resources and answers to frequently asked questions from A to Z.
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Hutchinson Encyclopedia "A subset of the content (concise set) is provided for free, the access to the rest of the Hutchinson Encyclopedia requires subscription."
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