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Encyclopedia

Columbia Encyclopedia, 6th Edition

www.bartleby.com/65/ -  Full access to 51,000 entries of this online version of a one-volume encyclopedia.

Encyclopedia Britannica

www.britannica.com/ -  This free version allows partial access to the "the world's most respected encyclopedia." 

Information Please Almanac

www.infoplease.com -  Includes a general, entertainment, and sports almanac.

Wikipedia

http://wikipedia.org/