• eXtension
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• AskOxford
  
  Free online World and US English dictionary with puzzles & games, tips & guidance about better writing, spelling, grammar and other resources for children and schools by Oxford Dictionaries Online
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• Mathematica
  
  Wolfram Library Archive has thousands of downloadable resources for Mathematica and other Wolfram products, collected over the full history of Wolfram Research
  download mathsource
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• STAT-USA/Internet
  
  STAT-USA/Internet is the trusted source for economic statistics, international market research, and trade leads from across the Federal government.
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• CredoReference
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• Open Site
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• WWW Virtual Library
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• iTools
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• FactCheck.org
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