character: Hadrian
topic: Innovative materials: Use of concrete in Roman structures
grade: 12
subject: Geography
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character: Roman engineers
topic: Advancements in construction techniques
grade: 12
subject: Geography
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character: Architects of Ancient Rome
topic: Influence of concrete on Roman architecture
grade: 12
subject: Geography
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character: Hadrian's Wall
topic: Structural significance and use of concrete
grade: 12
subject: Geography
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