character: Cornelius Vanderbilt
topic: Railroads
grade: 2
subject: History
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character: John D. Rockefeller
topic: Industrial Revolution
grade: 2
subject: History
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character: George Westinghouse
topic: Inventions and Railroads
grade: 2
subject: History
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character: Andrew Carnegie
topic: Steel and Railroads
grade: 2
subject: History
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