Encyclopedias
Encyclopedia.com - http://www.encyclopedia.com
Online dictionary and encyclopedia with pictures, facts, and videos.
Wikipedia - http://www.wikipedia.org/
The free encyclopedia that anyone can edit.
Britannica Online Encyclopedia - http://www.britannica.com/
Explore the updated online encyclopedia with hundreds of thousands of articles, biographies, videos, images, and web sites.
Symbols.com - http://www.symbols.com/
Contains more than 1,600 articles about 2,500 Western signs, arranged into 54 groups according to their graphic characteristics.
Bartleby.com - http://www.bartleby.com/
Publishes thousands of free online classics of reference, literature and nonfiction.
Online Encyclopedia - http://encyclopedia.jrank.org/
Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.