ATID Jewish Encyclopedia [ Kids/Teens/Mature Teens ] - The Jewish Encyclopedia For Kids is made as an online educational site for children who are interested in Jewish facts and history. http://www.geocities.com/atid10/ency.htm

Bartleby.com Reference [ Kids/Teens/Mature Teens ] - Reference site allows you to search over the Columbia Encyclopedia, the Encyclopedia of World History, fact books, thesauri, quotes, and more. http://www.bartleby.com/reference/

Children's Encyclopedia of Women [ Kids ] - Collection of articles about famous women written by third and fourth grade students. http://www2.lhric.org/pocantico/womenenc/womenenc.htm

Columbia Encyclopedia - 6th edition [ Teens/Mature Teens ] - Comprehensive online encyclopedia and database of over 51,000 entries. http://www.bartleby.com/65/

Encyclopaedia Britannica [ Teens/Mature Teens ] - Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial available. http://www.britannica.com/

Encyclopedia Smithsonian [ Kids/Teens/Mature Teens ] - Links to online Smithsonian resources and answers to frequently asked questions from A to Z. http://www.si.edu/resource/faq/start.htm

Encyclopedia.com [ Kids/Teens/Mature Teens ] - Free resource offers more than 50,000 concise articles. http://www.encyclopedia.com/

EncycloZine: Learning Fun! [ Kids/Teens/Mature Teens ] - 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. http://EncycloZine.com/

How Stuff Works [ Kids/Teens/Mature Teens ] - Articles explain how hundreds of things work, from elements of the human body to space-age technology. http://www.howstuffworks.com/

Instrument Encyclopedia [ Kids/Teens/Mature Teens ] - A guide to more than musical 140 instruments from all parts of the world. Includes photographs and descriptions. http://www.si.umich.edu/chico/instrument/

MSN Encarta Encyclopedia [ Kids/Teens/Mature Teens ] - Online home of the Encarta encyclopedia, world atlas, dictionary, thesaurus, multimedia collection, and homework tools. http://encarta.msn.com/

Open Site [ Teens/Mature Teens ] - A volunteer-run open content encyclopedia, inspired by the Open Directory Project. http://open-site.org/

Spartacus Educational [ Kids/Teens/Mature Teens ] - British online encyclopedia focuses on historical topics. Articles are geared toward students. http://www.spartacus.schoolnet.co.uk/

TechEncyclopedia [ Kids/Teens/Mature Teens ] - Contains descriptions and definitions of more than 14,000 computer terms and concepts. http://www.techweb.com/encyclopedia/

VetCentric Encyclopedia [ Kids/Teens/Mature Teens ] - Find articles on animal health care topics ranging from behavior and preventive care to common and not-so-common diseases. http://www.vetcentric.com/reference/encyc.cfm

Wikipedia [ Teens/Mature Teens ] - Free volunteer-edited encyclopedia with over 200,000 articles. http://en.wikipedia.org

wordIQ.com [ Teens/Mature Teens ] - An online encyclopedia with more than 400,000 pages of content. http://www.wordiq.com/encyclopedia.html

World Book Encyclopedia [ Kids/Teens ] - Offers in-depth information on a variety of subjects and educational activities for children. http://www.worldbook.com/