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Castle under siege! /

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  • "Looks at the simple machines used to build and defend castles, including pulleys, levers, wheels and axles, wedges, and screws."
  • "Discusses how simple machines can help to build a castle and defend it, too."

  • "History."
  • "Juvenile works."
  • "Juvenile works."@en
  • "Juvenile works"
  • "Juvenile works"@en
  • "History"

  • "Castle under siege!: simple machines /"
  • "Castle under siege! /"@en
  • "Castle under siege! : simple machines /"
  • "Castle under siege! /"