character: Minnie the Builder
topic: Challenges in Railroad Construction
grade: 4
subject: History
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character: Minnie the Builder
topic: Impact of Railroads on Communities
grade: 4
subject: History
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character: Minnie the Builder
topic: Engineering Innovations in the 1800s
grade: 4
subject: History
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character: Minnie the Builder
topic: Safety Measures in Railroad Construction
grade: 4
subject: History
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