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

Beschreibung:

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

Zugefügt zum Band der Zeit:

polio

BySophie
26 Nov 2017

Datum:

26 März 1953 Jahr
Jetzt
~ 71 years ago
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