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- Bartleby.com - Includes the Columbia Encyclopedia, Sixth Edition, dictionaries, and thesauri.
- Britannica Concise - Featuring 28,000 short articles.
- Classic Encyclopedia - Browsable online version of the 1911 edition of the Encyclopaedia Britannica.
- Encyberpedia - Electronic encyclopedia with its own content as well as over 10,000 links to the best reference sites on the Internet.
- Encyclopaedia Britannica Online - Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Full text for subscribers only; free trial available.
- Encyclopedia Smithsonian - Links to on-line Smithsonian resources and answers to frequently asked questions from A to Z.
- HighBeam Encyclopedia - Offers articles from the Columbia Encyclopedia and Britannica Concise Encyclopedia.
- How Stuff Works - Articles explain how hundreds of things work, from elements of the human body to space-age technology.
- Hutchinson Encyclopedia - "A subset of the content (concise set) is provided for free, the access to the rest of the Hutchinson Encyclopedia requires subscription."
- Information Please - Online dictionary, Columbia Encyclopedia, and almanac reference.
- Knol - Peer-reviewed encyclopedia from Google. Articles are written by named contributors.
- MSN Encarta Encyclopedia - Includes a world atlas, dictionary, thesaurus, multimedia collection, and homework tools.
- Nuttall Encyclopædia of General Knowledge - Approximately 14,000 entries on topics including art, geography, literature, philosophy, religion. Originally published in 1907.
- Online Encyclopedia - Offers articles from on the 11th edition Encyclopedia Britannica, and from the Crystal Reference Encyclopedia. All articles are searchable and alphabetized.
- The Probert Encyclopaedia - Reference source with several hypertext linked entries covering a broad variety of subjects.
- Simple English Wikipedia - User-contributed online encyclopedia intended for people whose first language is not English.
- Wikinfo - User edited encyclopedia based on Wiki software. Contains articles, information on editing, and a list of differences between this encyclopedia and Wikipedia.
- Wikipedia - A free encyclopedia with millions of articles contributed collaboratively using Wiki software, in dozens of languages.
- 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 for full articles.
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