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Bartleby.com

Containing nearly 51,000 entries (marshalling 6.5 million words on a vast range of topics), and with more than 80,000 hypertext cross-references, the current Sixth Edition is among the most complete and up-to-date encyclopedias ever produced.... Details

http://www.bartleby.com

Encyclopædia Britannica

A leading provider of learning and knowledge products. We're proud to be one of the world's most trusted sources of information on every topic imaginable - from the origins of the universe to current events and everything in between.... Details

http://www.britannica.com

Encyclopedia.com

Whether you're researching for school, writing a term paper, or simply looking to learn, Encyclopedia.com and HighBeam Research will provide you with very powerful tools.... Details

http://www.encyclopedia.com

Encyclozine

Articles and information on most topics in the arts, humanities, sciences, and technology. It also features games, puzzles, quizzes, mazes, and optical illusions.... Details

http://encyclozine.com

How Stuff Works

Widely recognized as a leading source for clear, unbiased, reliable explanations of how everything actually works. With thousands of articles, content features and illustrations populating ten different content channels.... Details

http://www.howstuffworks.com

Information Sphere

Welcome to the free encyclopedia: an online encyclopedia and search engine for terms and definitions. My mission is to encourage the use of freely available information via the internet.... Details

http://www.informationsphere.com

Online 1911 Encyclopedia

The Online Encyclopedia is based on the 11th Edition Encyclopedia Britannica, first published in 1911. This historically significant book is the last encyclopedia to offer articles in such extreme depth.... Details

http://encyclopedia.jrank.org

The Probert Encyclopaedia

Because we only use independent researchers, not sponsored by industry, corporations, governments or advertisers, our data is reliable and unbiased - unlike many other encyclopaedias.... Details

http://www.probert-encyclopaedia.co.uk

Wikinfo

Wikinfo can be used to obtain knowledge by anyone, and just as importantly, used to share knowledge with anyone, because it is a free encyclopedia written collaboratively by its readers and editors.... Details

http://www.wikinfo.org

Wikipedia

Begun in 2001, Wikipedia has rapidly grown into the largest reference website on the Internet. The content of Wikipedia is free, written collaboratively by people from all around the world.... Details

http://en.wikipedia.org