// todo need optimize like in event.jsp. Add indexing or not indexing this page. 1869 г. – открытие Д.И. Менделеевым (1834–1907) Периодического закона химических элементов. (1 gen 1869 anni – 1 gen 1869 anni) (Il nastro del tempo)
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1869 г. – открытие Д.И. Менделеевым (1834–1907) Периодического закона химических элементов. (1 gen 1869 anni – 1 gen 1869 anni)

Aggiunto al nastro di tempo:

Научные открытия и культурные достижения 19 века

ByАлексей Георгиевский
10 set 2018

Data:

1 gen 1869 anni
1 gen 1869 anni
~ 0 min

Immagini:

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