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Online Encyclopedias are equivalent of classic book encyclopedias. They are collections of articles on a wide variety of subjects, alphabetically arranged. Encyclopedias include a search engine for quick searching of their own contents.

Free Most Popular Online Encyclopedias

Britannica's Internet Guide Encyclopedia.com Information Please Bartleby Reference Encarta Wikipedia

National Geographic The World History Project The Catholic Encyclopedia MedlinePlus Wiley InterScience Healthopedia