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General

• The Columbia Encyclopedia Sixth Edition via Bartleby's Free online access to a most complete encyclopedia containing approximately 51,000 entries with hypertext cross-references.
• Britannica Encyclopedia [subscription required for full access]The oldest continuously English-language published encyclopedia since 1768, and regarded for its high level of scholarship. The free online version provides limited entries with brief summary articles.
• MSN Encarta EncyclopediaMSN Encarta Encyclopedia provides approximately 4,500 articles on the world of knowledge with tools such as Literature Guides, Homework Starters, and Sidebars.
• World Book Encyclopedia - Free Encyclopedia, Dictionary, Atlas, Homework HelpAn encyclopedia designed to be user-friendly with limited free entries. The World Book is intent on providing accurate, objective, and reliable research materials for both children and adults.
• FactMonsterGeared towards children in mind, this encyclopedia introduces material in easy-to-swallow entries that are short and provide references for further exploration.
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• MedlinePlus: Medical EncyclopediaThe A.D.A.M. Medical Encyclopedia includes over 4,000 articles about diseases, tests, symptoms, injuries, and surgeries. Provided as a service by the U.S. National Library of Medicine and the National Institutes of Health
• The Cambridge History of English and American Literature via Bartleby'sAn eighteen-volume set encyclopedia that contains essay topics ranging from poetry, fiction, drama and essays to history, theology and political writing. The set encompasses a wide selection of writing on orators, humorists, poets, newspaper columnists, religious leaders, economists, Native Americans, song writers, and even non-English writing, such as Yiddish and Creole.
• Stanford Encyclopedia of Philosophy Designed as like a wikipedia, the SEP database of articles on philosophers and their ideas are written by experts or group of experts in the field, then reviewed and approved by the editorial board before online pulication.
• TechWeb: TechEncyclopediaContains descriptions and definitions of more than 14,000 computer terms and concepts, includes illustrations and diagrams.