Abacus: Most Up-to-Date Encyclopedia, News & Reviews

Chapter 14 Abacus Manuals, Schools and Urban Readers in Early Modern Venice and Milan in: The Book World of Early Modern Europe

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The Encyclopedia of How It Works from Abacus to Zoom Lens by Donald Clarke, HCDJ

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Abacus - Wikipedia

Vocational Significance of the Abacus for the Blind - Fred L. Gissoni, 1963

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