character: Irrigation Engineer
topic: Use of Canals for Farming
grade: 4
subject: History
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character: Ancient Farmer
topic: History of Farming Techniques
grade: 4
subject: History
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character: Civilization Builder
topic: Development of Water Management Systems
grade: 4
subject: History
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character: Agricultural Innovator
topic: Impact of Irrigation on Crop Production
grade: 4
subject: History
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