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Located: central america
Accomplishments: the calendar was one of the best accomplishments -
located:constantinople
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located:west africa
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located:northeastern africa
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located:china
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located:Arabian Peninsula
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located: japan
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located:western and central europe
accomplishments: The aqueducts, They were made from a series of pipes, and tunnels -
located:west africa
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located:central mexico
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located: southeastern peru
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located:west africa