File:Checker counting board.jpg

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English: checker counting board in a 18th century Japanese mathematics book
中文（简体）：18 世纪日本格子筹算版
Date 18th century
date QS:P,+1750-00-00T00:00:00Z/7
Source mybook
Author AnonymousUnknown author
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Date/TimeThumbnailDimensionsUserComment
current10:49, 25 July 2011Thumbnail for version as of 10:49, 25 July 20111,559 × 1,580 (974 KB)Gisling (talk | contribs)

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