File:Blackboard-620x388.jpg
Blackboard-620x388.jpg (620 × 388 pixels, file size: 79 KB, MIME type: image/jpeg)
Extended version of image http://mizugadro.mydns.jp/t/index.php/File:Mathematics.jpeg
Source: http://theins.ru/obshestvo/15432 Александр Литой. Напряжение и сопротивление. В Физтехе взбунтовались 80 преподавателей. Александр Литой. 29.10.2015
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