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Titles
- Letter from Simon Flexner, Rockefeller Institute for Medical Research to Michael Heidelberger1
- Letter from Theodore Sheldon to Florence R. Sabin1
- Letter from Thomas Haines to Hugh Cumming1
- Letter from Thomas Salmon to Lawrence Kolb1
- Letter from Thomas W. Salmon to Lawrence Kolb1
- Letter from Virginia Apgar to Helen Apgar1
- Letter from Virginia Apgar to Helen M. Voorhees1
- Letter from Winifred Putnam to Levi Nutt1