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Source/Further reading:
www.cdc.gov/polio/what-is-pol...)
www.marchofdimes.org/mission/...
encrypted-tbn0.gstatic.com/im...
www.ncbi.nlm.nih.gov/pmc/arti...
• April 12 1955: Polio A...
www.achievement.org/wp-conten...
www.scientificamerican.com/ar...
“The Polio Crusade” American Experience, PBS (Documentary)