• Bartleby
  
  Bartleby.com publishes thousands of free online classics of reference, literature and nonfiction
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• Beyond Wikipedia
  20 References You Can't Do Without | Scholastici.us: Student Productivity At Its Finest
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• ChemgaPedia
  Chemie-Enzyklopädie
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• Information Please
  
  Information Please is the world's largest free reference site. Here you can find facts on thousands of subjects including sports, entertainment, technology, business, education, and health.
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• Stanford Encyclopedia of Philosophy
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• The Free Dictionary
  Online Dictionary, Encyclopedia and Thesaurus. Free access.
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• The Internet Encyclopedia of Philosophy
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