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26 mar 1953 ano - Jonas Salk announced that he was developing a trial vaccine for polio.
Descrição:
Jonas Salk announced that he was developing a trial vaccine for polio.
Adicionado na linha do tempo:
polio
By
Sophie
26 nov 2017
1
0
383
Data:
26 mar 1953 ano
Agora
~ 71 years ago
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