Reference
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Browsable online version of the 1911 edition of the Encyclopaedia Britannica.
http://www.1911encyclopedia.org/
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Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements.
http://www.britannica.com/
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Offers articles from the Columbia Encyclopedia and Britannica Concise Encyclopedia.
http://www.encyclopedia.com/
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Articles explain how hundreds of things work, from elements of the human body to spaceage technology.
http://www.howstuffworks.com/
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"A subset of the content (concise set) is provided for free, the access to the rest of the Hutchinson Encyclopedia requires subscription.
http://encyclopedia.farlex.com/
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Online dictionary, Columbia Encyclopedia, and almanac reference.
http://www.infoplease.com/
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Includes a world atlas, dictionary, thesaurus, multimedia collection, and homework tools.
http://encarta.msn.com/
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Offers articles from on the 11th edition Encyclopedia Britannica, and from the Crystal Reference Encyclopedia.
http://encyclopedia.jrank.org/
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Reference source with several hypertext linked entries covering a broad variety of subjects.
http://www.probert-encyclopaedia.co.uk/
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Usercontributed online encyclopedia intended for people whose first language is not English.
http://simple.wikipedia.org/
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User edited encyclopedia based on Wiki software.
http://www.wikinfo.org/
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A free encyclopedia with millions of articles contributed collaboratively using Wiki software, in dozens of languages.
http://wikipedia.org/
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Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs.
http://www.worldbook.com/
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