character: John D. Rockefeller
topic: Railroads and Economic Growth
grade: 6
subject: Science
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character: Cornelius Vanderbilt
topic: Impact of Railroads on Industrialization
grade: 6
subject: Science
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character: Andrew Carnegie
topic: Steel Industry and Railroads
grade: 6
subject: Science
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character: Henry Ford
topic: Innovation in Transportation and Economy
grade: 6
subject: Science
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