Encyclopedias

Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs.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

A free encyclopedia with millions of articles contributed collaboratively using Wiki software, in dozens of languages.more

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

Reference source with entries covering a broad variety of subjects.more

Usercontributed online encyclopedia intended for people whose first language is not English.more

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

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

Peerreviewed encyclopedia from Google. Articles are written by named contributors.more

Online dictionary, Columbia Encyclopedia, and almanac reference.more

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