Published On May 12, 2009
Archival footage showing children afflicted with polio, Jonas Salk giving injections, an immunization centre, and vials of vaccine being produced.
http://www.britannica.com/eb/article-...
show more
To download video: Right click on the following button and select "Save Link As"
To download mp3 (audio): Click "Download mp3" button
Download mp3Copyright © 2024, All Rights Reserved!