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1 gen 1960 anni - Polio Vacciene

Descrizione:

Jonas Salk developed the first effective polio vaccine.

Aggiunto al nastro di tempo:

Contemporary Timeline

ByEllora Dey
29 nov 2018
0
0
401

Data:

1 gen 1960 anni
Adesso
~ 65 years ago

Immagini:

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