Image: Abacus 6
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Description: English: Abacus
Title: Abacus 6
Credit: Article for "abacus", 9th edition Encyclopedia Britannica, volume 1 (1875); scanned and uploaded by Malcolm Farmer Transferred from en.wikipedia to Commons.
Author: Encyclopædia Britannica
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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