character: Claudius Ptolemy
topic: Geographical Coordinates and Mapping Techniques
grade: 6
subject: Geography
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character: Eratosthenes
topic: Early Methods of Measuring Earth’s Circumference
grade: 6
subject: Geography
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character: Mercator
topic: Invention of the Mercator Projection
grade: 6
subject: Geography
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character: Gerardus Mercator
topic: Development of Modern Cartography
grade: 6
subject: Geography
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