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What is Polio?
Effects Of Polio
History
Contact
Work Cited
Home
What is Polio?
Effects Of Polio
History
Contact
Work Cited
Work Cited
"Salk Produces Polio Vaccine."
PBS
. PBS, n.d. Web. 20 June 2016.
"About Jonas Salk - Salk Institute for Biological Studies."
Salk Institute for Biological Studies
. Copyright 2016 Salk Institute for Biological Studies, n.d. Web. 20 June 2016.