character: Inca Engineers
topic: Building Techniques of the Incas
grade: 3
subject: History
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character: Inca Builders
topic: Stone Masonry Techniques
grade: 3
subject: History
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character: Inca Architects
topic: Road and Bridge Construction
grade: 3
subject: History
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character: Incan Civilization
topic: Innovations in Agriculture and Irrigation
grade: 3
subject: History
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