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26 marzo 1953 anni - Jonas Salk announced that he was developing a trial vaccine for polio.

Descrizione:

Jonas Salk announced that he was developing a trial vaccine for polio.

Aggiunto al nastro di tempo:

polio

BySophie
26 nov 2017

Data:

26 marzo 1953 anni
Adesso
~ 71 years ago
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