Mary N Crawford, shown sitting next to blackboard 3321962495 o

---

Size: 1424px × 1754px
Photo credit: © Len Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -, 2009, 20th, 6-7, ancient, archives, blackboard, bloedgroep, blood, bloodtypes, book, bygone, century, chalkboard, childrenshospitalofphiladelphia, chop, copy, cover, crawford, editorial, hematology, historic, history, illustration, immunology, institution, krijt, labcoat, mary, medicine, mid, month, news, nostalgia, nostalgic, pearls, philadelphia, photo, photograph, photography, physician, private, schoolbord, science, scientist, serum, smile, smiling, smithsonian, space, stock, teacher, textbook, transfusion, type, vintage, vrouw, woman, women, womens, womensday