1957 Press Photo Dr. Jonas Salk and his three sons prepare to set sail

Dr. Jonas Salk, famed developer of the anti-polio vaccine, wife Donna, and three sons (L to R): Jonathan, 7; Darrel, 10; and Peter, 13, prepare to sail aboard the United States for Europe June 14th. Salk's headed for International Polio Conference in Gen

Photo is dated 1957.

Photo measures 6.75 x 5.5 inches.

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