character: Marcus Vitruvius Pollio
topic: Roman Engineering and Architecture
grade: 12
subject: Geography
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character: Ferdinand de Lesseps
topic: Canal Engineering and Water Management
grade: 12
subject: Geography
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character: Leonardo da Vinci
topic: Innovations in Hydraulics
grade: 12
subject: Geography
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character: John Snow
topic: Water Supply and Sanitation
grade: 12
subject: Geography
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