| Encyclopaedia Britannica Online - Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial.
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| World Book Encyclopedia - Offers in-depth information on a variety of subjects and educational activities for children.
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| EncycloZine: Learning Fun! - EncycloZine is a concise illustrated encyclopedic portal covering a wide range of topics in the arts, humanities, sciences, and technology. It also features games, puzzles, quizzes, and a multimedia gallery.
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| The Probert Encyclopaedia - Reference source with several hypertext linked entries covering a broad variety of subjects.
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| 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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| Informationsphere.com - Free online encyclopedia that allows users to submit their own articles for inclusion in its database.
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| Encyclopedia FunTrivia - Thousands of categorized entries of trivia - an invaluable resource for answer seekers.
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| Encyclopedia Smithsonian - Links to online Smithsonian resources and answers to frequently asked questions from A to Z.
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| Bartleby.com - Online publication of the Columbia Encyclopedia, Sixth Edition.
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| Encyclopedia Britannica, 1911 Edition - Browsable full text of the 11th edition.
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| How Stuff Works - Over 50 'How Stuff Works' articles.
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| Encyclopedia.com - Free resource offers more than 50,000 concise articles.
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| Free Internet Encyclopedia - An encyclopedia composed of information available on the Internet. MacroReference contains references to large areas of knowledge, FAQs where available, and pointers to relevant areas of the MicroReference. MicroReference contains short bits of information and references to specific subjects.
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| Wikipedia - Free volunteer-edited encyclopedia with over 200,000 articles.
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| Wikinfo - User edited encyclopedia based on Wiki software. Contains articles, information on editing, and a list of differences between this encyclopedia and Wikipedia.
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| World Book Encyclopedia - Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs. Requires free temporary registration with option to buy continued access.
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| HighBeam Library Research - Possible to conduct research using a database of reliable sources.
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