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Harry Potter main book series sales can be confirmed by us in under 5 minutes to be 850 million or greater.

Created by BathLW on 2014-11-02; known on 2014-11-02; judged wrong by BathLW on 2014-11-02.

  • BathLW estimated 28% on 2014-11-02
  • BathLW   judged this prediction wrong on 2014-11-02.