Roberto Gerhard

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• Biographies (http://www.academickids.com/encyclopedia/index.php/Biographies)
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• Geography (http://www.academickids.com/encyclopedia/index.php/Geography)
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• History (http://www.academickids.com/encyclopedia/index.php/History)
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  • Industrial Revolution (http://www.academickids.com/encyclopedia/index.php/Industrial_Revolution)
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  • United States (http://www.academickids.com/encyclopedia/index.php/United_States)
  • Wars (http://www.academickids.com/encyclopedia/index.php/Wars)
  • World History (http://www.academickids.com/encyclopedia/index.php/History_of_the_world)

• Human Body (http://www.academickids.com/encyclopedia/index.php/Human_Body)
• Mathematics (http://www.academickids.com/encyclopedia/index.php/Mathematics)
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  • Religion (http://www.academickids.com/encyclopedia/index.php/Religion)
  • Holidays (http://www.academickids.com/encyclopedia/index.php/Holidays)
• Space and Astronomy
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  • Planets (http://www.academickids.com/encyclopedia/index.php/Planets)
• Sports (http://www.academickids.com/encyclopedia/index.php/Sports)
• Timelines (http://www.academickids.com/encyclopedia/index.php/Timelines)
• Weather (http://www.academickids.com/encyclopedia/index.php/Weather)
• US States (http://www.academickids.com/encyclopedia/index.php/US_States)

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