File:Mary N. Crawford, shown sitting next to blackboard (3321962495).jpg
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Categories:
- Women sitting indoors
- Women with pearl necklaces
- Black and white photographs of short hair
- Black and white photographs of females with objects
- 1962 in Philadelphia
- Immunologists
- Portrait photographs of women wearing pearl jewellery
- Black and white photographs of women smiling with teeth
- Black and white photographs of females looking at viewer
- People with lab coats
- Portrait photographs of women with gray background
- Women writing
- Pleasure
- Smithsonian Institution Archives
- Hospitals in Philadelphia
- Hematologists