He developed a vaccine against polio. O Harry S. Truman O Dr. Jonas Salk O Dr. Benjamin Spock

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He developed a vaccine against polio.
O Harry S. Truman
O Dr. Jonas Salk
O Dr. Benjamin Spock
Transcribed Image Text:He developed a vaccine against polio. O Harry S. Truman O Dr. Jonas Salk O Dr. Benjamin Spock
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