File:SalkatPitt (cropped).jpg
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分类:
- Biologists at work
- Black and white photographs of men at work
- Black and white photographs of Pennsylvania
- Black and white photographs of the United States in the 1950s
- Jonas Salk
- Men at work in Pennsylvania
- Men smiling while standing
- Black and white photographs of men wearing neckties
- Men wearing glasses
- 1957 in Pennsylvania
- 1957 black and white portrait photographs of men
- Men of the United States in 1957
- Men with bottles
- Polio vaccine
- University of Pittsburgh