character: Marco Polo
topic: Exploration of Trade Routes
grade: 3
subject: History
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character: Ibn Battuta
topic: Journeys and Trade in the Islamic World
grade: 3
subject: History
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character: Christopher Columbus
topic: Exploration and the Spice Trade
grade: 3
subject: History
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character: Zheng He
topic: Chinese Admiral and Maritime Trade
grade: 3
subject: History
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