Dr. Jonas Salk's Polio Vaccine Trials Began - Feb. 23, 1954
This Day in History Class - Podcast autorstwa iHeartPodcasts and HowStuffWorks
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On this day in 1954, Dr Jonas Salk's polio vaccine trials began.
This Day in History Class - Podcast autorstwa iHeartPodcasts and HowStuffWorks
On this day in 1954, Dr Jonas Salk's polio vaccine trials began.