character: Andrew Carnegie
topic: Steel Production and Economic Growth
grade: 3
subject: History
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character: John D. Rockefeller
topic: Oil Industry and Economic Impact
grade: 3
subject: History
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character: Thomas Edison
topic: Inventions and Industrial Growth
grade: 3
subject: History
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character: Henry Ford
topic: Automobile Industry and Economic Change
grade: 3
subject: History
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