Concept
Version 4
Created by Boundless
Administration of the Inca Empire
Inca quipu
These complex recording devices allowed officials to keep track of taxes, labor, and goods in a precise fashion.
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"Inca Quipu."
https://en.wikipedia.org/wiki/Quipu#/media/File:Inca_Quipu.jpg
Wikipedia
CC BY-SA 3.0.