File:TheStephensonAbacus-ArchD.pdf

TheStephensonAbacus-ArchD.pdf(file size: 2.68 MB, MIME type: application/pdf)

Full size counting board abacus (36 in. x 24 in.)

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current11:25, 2 September 2013 (2.68 MB)Sks23cu (talk | contribs)
10:48, 2 September 2013 (7.35 MB)Sks23cu (talk | contribs)
07:34, 10 August 2013 (2.21 MB)Sks23cu (talk | contribs)Full size counting board abacus (36 in. x 24 in.)
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