character: Emperor Wu of Han
topic: Silk Production and Trade during the Han Dynasty
grade: 3
subject: Geography
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character: Silk Worms
topic: Silk Production Process
grade: 3
subject: Geography
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character: Silk Road Traders
topic: Trade Routes for Silk
grade: 3
subject: Geography
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character: Zhang Qian
topic: Exploration of the Silk Road
grade: 3
subject: Geography
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