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character: Eratosthenes
topic: Calculating the Earth's Circumference
grade: 11
subject: Geography
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character: Ptolemy
topic: Ancient Geographical Measurements
grade: 11
subject: Geography
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character: Archimedes
topic: Mathematical Approaches to the Earth's Size
grade: 11
subject: Geography
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character: Isaac Newton
topic: Later Developments in Earth's Measurement
grade: 11
subject: Geography
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