character: Inca Engineers
topic: Techniques in Inca Road Construction
grade: 6
subject: Social Studies
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character: Inca Builders
topic: Use of Stone and Mortar in Roadways
grade: 6
subject: Social Studies
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character: Inca Civilization
topic: Importance of Roads for Trade and Communication
grade: 6
subject: Social Studies
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character: Inca Road System
topic: Innovations in Engineering and Sustainability
grade: 6
subject: Social Studies
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