character: Inca Builders
topic: Engineering Techniques
grade: 3
subject: History
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character: Quechua People
topic: Architecture and Construction
grade: 3
subject: History
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character: Machu Picchu
topic: Inca Engineering Marvels
grade: 3
subject: History
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character: Inca Road System
topic: Transportation and Infrastructure
grade: 3
subject: History
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