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	Wikipedia - http://en.wikipedia.org/wiki/Main_Page Free volunteer-edited encyclopedia with over 2.1 million articles.
	Encyclopaedia Britannica - http://www.britannica.com/ Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial available.
	Columbia Encyclopedia - 6th edition - http://www.bartleby.com/65/ Comprehensive online encyclopedia and database of over 51,000 entries.
	Open Site - http://open-site.org/ A volunteer-run open content encyclopedia, inspired by the Open Directory Project.
	Encyclopedia.com - http://www.encyclopedia.com/ Free resource offers more tens of thousands of articles from multiple sources.

	Bartleby.com Reference - http://www.bartleby.com/reference/ Reference site allows you to search over the Columbia Encyclopedia, the Encyclopedia of World History, fact books, thesauri, quotes, and more.
	TechEncyclopedia - http://www.techweb.com/encyclopedia/ Contains descriptions and definitions of more than 14,000 computer terms and concepts.
	World Book Encyclopedia - http://www.worldbook.com/ Offers in-depth information on a variety of subjects and educational activities for children.
	Encyclopedia Smithsonian - http://www.si.edu/Encyclopedia_SI/ Links to online Smithsonian resources and answers to frequently asked questions from A to Z.
	EncycloZine: Learning Fun! - http://encyclozine.com/ 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.

	Spartacus Educational - http://www.spartacus.schoolnet.co.uk/ British online encyclopedia focuses on historical topics. Articles are geared toward students.
	Children's Encyclopedia of Women - http://www2.lhric.org/pocantico/womenenc/womenenc.htm Collection of articles about famous women written by third and fourth grade students.
	Instrument Encyclopedia - http://www.si.umich.edu/chico/instrument/ A guide to more than musical 140 instruments from all parts of the world. Includes photographs and descriptions.
	How Stuff Works - http://www.howstuffworks.com/ Articles explain how hundreds of things work, from elements of the human body to space-age technology.
	ATID Jewish Encyclopedia - http://www.geocities.com/atid10/ency.htm The Jewish Encyclopedia For Kids is made as an online educational site for children who are interested in Jewish facts and history.

	wordIQ.com - http://www.wordiq.com/encyclopedia.html An online encyclopedia with more than 400,000 pages of content.
	2007 Wikipedia Selection for schools - http://schools-wikipedia.org/ Selection of Wikipedia articles chosen and checked for accuracy.
	MSN Encarta Encyclopedia - http://encarta.msn.com/ Includes a world atlas, dictionary, thesaurus, multimedia collection, and homework tools.
	VetCentric Encyclopedia - http://www.vetcentric.com/reference/encyc.cfm Find articles on animal health care topics ranging from behavior and preventive care to common and not-so-common diseases.

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The content of the Google directory is based on the Open Directory and is enhanced using Google's own technology.
The following Open Directory editors contributed to this category:
jsolaro