https://aeon.co/ideas/the-khipu-code-the-knotty-mystery-of-the-inkas-3d-records?utm_source=Aeon+Newsletter&utm_campaign=9fe66d9984-EMAIL_CAMPAIGN_2018_06_14_12_53&utm_medium=email&utm_term=0_411a82e59d-9fe66d9984-69623653
The khipu code: the knotty mystery of the Inkas’ 3D records
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