File:PSM V26 D462 The new universal abacus.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:09, 7 September 2010 | 1,378 × 1,296 (428 KB) | Ineuw | {{Information |Description = The new universal abacus |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_26.djvu/462 |Date = 1884-1885 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category:Popular Scie |
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