Image: BogdanovBelsky UstnySchet
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Title: Russian: «Устный счёт. В народной школе С.А.Рачинского» Mental Calculation. In Public School of S. A. Rachinsky
Credit: 1. history.sgu.ru 2. booksite.ru 3. eldibujante.com
Author: Nikolay Bogdanov-Belsky
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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