Abacus - Wikipedia
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Description
File:Wooden Iranian abacus - made in Nishapur 1.JPG - Wikipedia
Roman abacus - Wikipedia
File:Abacus Base Five Ten.PNG - Wikipedia
File:Abacus, Central Asian Museum.jpg - Wikipedia
How to Use an Abacus (with Pictures) - wikiHow
History of Computers, Computer-science Wiki
Abacus - Wikipedia
How to Use an Abacus (with Pictures) - wikiHow
Abacus - Wikipedia
File:Indian Abacus .jpg - Wikipedia
Mic-UK: A gallery of a selection of calculating aid designs
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