character: Admiral Zheng He
topic: Importance of Sea Trade Routes
grade: 3
subject: History
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character: Christopher Columbus
topic: Exploration of New Trade Routes
grade: 3
subject: History
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character: Ferdinand Magellan
topic: Circumnavigation and Trade
grade: 3
subject: History
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character: Vasco da Gama
topic: Sea Routes to India
grade: 3
subject: History
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