Encyclopaedia Britannica Online
Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial.

World Book Encyclopedia
Publisher site promoting sales of bound copies and offering link to online version.

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.

The Probert Encyclopaedia
Reference source with several hypertext linked entries covering a broad variety of subjects.

Encyberpedia
Electronic encyclopedia with its own content as well as over 10,000 links to the best reference sites on the Internet.

Informationsphere.com
Free online encyclopedia that allows users to submit their own articles for inclusion in its database.

Encyclopedia FunTrivia
Thousands of categorized entries of trivia - an invaluable resource for answer seekers.

Encyclopedia Smithsonian
Links to on-line Smithsonian resources and answers to frequently asked questions from A to Z.

Bartleby.com
Online publication of the Columbia Encyclopedia, Sixth Edition.

Encyclopedia Britannica, 1911 Edition
Browsable full text of the 11th edition.

How Stuff Works
Articles explain how hundreds of things work, from elements of the human body to space-age technology.

Encyclopedia.com from Electric Library
Free resource offers more than 50,000 concise articles.

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 information and references to specific subjects.

Wikipedia
A free encyclopedia built collaboratively using Wiki software. (GNU Free Documentation License).

Wikinfo
User edited encyclopedia based on Wiki software. Contains articles, information on editing, and a list of differences between this encyclopedia and Wikipedia.

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Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs.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.

HighBeam Library Research
Possible to conduct research using a database of reliable sources.