character: Marco Polo
topic: Exploration and Trade in the Silk Road
grade: 9
subject: Geography
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character: Silk Road Merchants
topic: Trade Routes and Economic Impact
grade: 9
subject: Geography
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character: Kublai Khan
topic: Mongol Empire and Its Influence on Trade
grade: 9
subject: Geography
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character: Zheng He
topic: Comparison of Explorers and Maritime Trade
grade: 9
subject: Geography
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