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character: Claudius Ptolemy
topic: Geographic Coordinates System
grade: 9
subject: Geography
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character: Eratosthenes
topic: Early Coordinate Systems
grade: 9
subject: Geography
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character: Hipparchus
topic: Development of Latitude and Longitude
grade: 9
subject: Geography
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character: Gerardus Mercator
topic: Map Projections and Coordinate Systems
grade: 9
subject: Geography
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