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Encyclopedias
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- Encyclopaedia Britannica
- Columbia Encyclopedia, Sixth Edition. 2001-05. Bartleby.com
- CredoReference
- Encyclopedia Article Center - MSN Encarta
- infoplease Encyclopedia, Almanac, Atlas, Biographies, Dictionary, Thesaurus. Free online reference, research & homework help.
- Symbols.com
- Wikipedia, the free encyclopedia