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22 agos 1947 anni - Promecio

Descrizione:

Se rellenó el último hueco, el correspondiente al elemento número 61 (promecio).

Aggiunto al nastro di tempo:

Historia de la Química

ByDaniel Martinez Alzate
21 feb 2019
0
0
678

Data:

22 agos 1947 anni
Adesso
~ 77 years ago
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