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DescriptionSalkatPitt.jpg English: Jonas Salk at the University of Pittsburgh where he developed the first polio vaccine. Date 1957 Source University of...(250 × 309 (12 KB)) - 15:20, 15 November 2023
DescriptionSalkatPitt (cropped).jpg English: Jonas Salk at the University of Pittsburgh where he developed the first polio vaccine. Date 1957 Source University...(250 × 188 (9 KB)) - 15:20, 15 November 2023
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