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_-_(MeisterDrucke-444496).jpg "Abacus, Bead Calculator, probably 19th century (wood and metal)")
Abacus, Bead Calculator, probably 19th century (wood and metal)
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How Do You Calculate on the Abacus? | blog@CACM | Communications of the ACM
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Abacus - Wikipedia
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How to Use an Abacus (with Pictures) - wikiHow
