Bartleby.com
   Online publication of the Columbia Encyclopedia, Sixth Edition.
   http://www.bartleby.com/65

Encyberpedia
   Electronic encyclopedia with its own content as well as over 10,000 links to the best reference sites on the Internet.
   http://www.encyberpedia.com/cyberlinks/links/index.html

EncycloZine
   Portal/concise encyclopedia offers fun activities for learning and exercising the mind. Daily articles introduce new topics in the arts, humanities, science, and technology, and provide links to related sites.
   http://EncycloZine.com/

Encyclopaedia Britannica Online
   Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial.
   http://www.eb.com/

Encyclopaedia Britannica, 1911 Edition
   Browsable full text of the 11th edition.
   http://www.1911encyclopedia.org/

Encyclopedia FunTrivia
   Thousands of categorized entries of trivia - an invaluable resource for answer seekers.
   http://www.funtrivia.com/trivia.html

Encyclopedia Smithsonian
   Links to on-line Smithsonian resources and answers to frequently asked questions from A to Z.
   http://www.si.edu/resource/faq/start.htm

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 informatio
   http://www.cam-info.net/enc.html

HighBeam Library Research
   Possible to conduct research using a database of reliable sources.
   http://www.highbeam.com/library/

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

Informationsphere.com
   Free online encyclopedia that allows users to submit their own articles for inclusion in its database.
   http://www.informationsphere.com/

The Probert Encyclopaedia
   Reference source with several hypertext linked entries covering a broad variety of subjects.
   http://www.probert-encyclopaedia.co.uk/

Wikinfo
   User edited encyclopedia based on Wiki software. Contains articles, information on editing, and a list of differences between this encyclopedia and Wikipedia.
   http://www.wikinfo.org/

Wikipedia
   A free encyclopedia built collaboratively using Wiki software. (GNU Free Documentation License).
   http://en.wikipedia.org

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.
   http://www.worldbookonline.com/