Reference / Encyclopedias /
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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Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs.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.6
206,836
NA
4,700,000
33,400
43
The Probert Encyclopaedia
Reference source with several hypertext linked entries covering a broad variety of subjects.6
6,294,002
NA
33,300
4
NA
Classic Encyclopedia
Browsable online version of the 1911 edition of the Encyclopaedia Britannica.6
113,832
NA
1,300,000
25,700
33
How Stuff Works
Articles explain how hundreds of things work, from elements of the human body to space-age technology.5
807
NA
22,300,000
214,000
275
HighBeam Encyclopedia
Offers articles from the Columbia Encyclopedia and Britannica Concise Encyclopedia.9
2,368
71
419,000,000
928,000
800
Wikinfo
User edited encyclopedia based on Wiki software. Contains articles, information on editing, and a list of differences between this encyclopedia and Wikipedia.5
383,830
NA
392,000
11,100
94
Online Encyclopedia
Offers articles from on the 11th edition Encyclopedia Britannica, and from the Crystal Reference Encyclopedia. All articles are searchable and alphabetized.4
21,177
NA
624,000
162,000
5
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.9
3,041
9
40,900,000
121,000
1
Britannica Concise
Featuring 28, 000 short articles.6
3,029
NA
1,950,000
1,280
1
Bartleby.com
Includes the Columbia Encyclopedia, Sixth Edition, dictionaries, and thesauri.8
15,273
NA
8,400,000
180,000
7
12
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