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27 avr. 1869 - Менделеев открыл периодический закон химических элементов.
Ajouté au bande de temps:
развитие науки
By
Илона Балани
23 déc. 2017
0
0
557
Date:
27 avr. 1869
Maintenaint
~ Il y a 156 ans
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