• Bundeszentrale für politische Bildung
  German institution to provide citizens with political, knowlege, society, ( sources mostly free)
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• Answers.com
  Online Dictionary, Encyclopedia and much more Answers.com is your free "one-stop shop" with instant information on over 4 million topics. We deliver useful answers in a snap. Look up any word or phrase for the best definition or explanation on the Web. Not lists of links... just the information you're looking for.
  Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. Ask questions, get answers.
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• wissen.de
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• WorldCat.org
  Suchen Sie nach Büchern, Musik, Videos, Aufsätzen und nach vielem mehr in Bibliotheken in Ihrer Nähe.
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• Yahoo! Clever – Germany
  Yahoo! Answers find and share information.
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