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Dr. Jonas Salk poses for a portrait at the Salk Institute February 25, 1975 in La Jolla, California. He was the first researcher to develop a safe and effective vaccine for polio. |
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Dr. Jonas Salk poses for a portrait at the Salk Institute February 25, 1975 in La Jolla, California. He was the first researcher to develop a safe and effective vaccine for polio. |
|
Write a Letter
to the Editor |