character: John A. Roebling
topic: Innovations in bridge design
grade: 8
subject: History
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character: John A. Roebling
topic: Construction of the Brooklyn Bridge
grade: 8
subject: History
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character: Isambard Kingdom Brunel
topic: Engineering and bridge innovations
grade: 8
subject: History
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character: Charles Ellet Jr.
topic: Early American bridge design
grade: 8
subject: History
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