Includes the Columbia Encyclopedia, Sixth Edition, dictionaries, and thesauri.

Featuring 28,000 short articles.

Browsable online version of the 1911 edition of the Encyclopaedia Britannica.

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

Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Full text for subscribers only; free trial available.

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

Offers articles from the Columbia Encyclopedia and Britannica Concise Encyclopedia.

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

"A subset of the content (concise set) is provided for free, the access to the rest of the Hutchinson Encyclopedia requires subscription."

Online dictionary, Columbia Encyclopedia, and almanac reference.

Peer-reviewed encyclopedia from Google. Articles are written by named contributors.

Approximately 14,000 entries on topics including art, geography, literature, philosophy, religion. Originally published in 1907.

Offers articles from on the 11th edition Encyclopedia Britannica, and from the Crystal Reference Encyclopedia. All articles are searchable and alphabetized.

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

User-contributed online encyclopedia intended for people whose first language is not English.