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Titles
- Letter from Marguerite Stein to Florence R. Sabin3
- Letter from Alan Gregg to Mark May1
- Letter from Charles R. Drew to his mother, Nora1
- Letter from Edward L. Tatum to Nils Fries1
- Letter from Elvin A. Kabat to Michael Heidelberger1
- Letter from F. W. Clement to Virginia Apgar1
- Letter from Florence R. Sabin to Charles A. Doan1
- Letter from Linus Pauling to H. D. Springall1
- Letter from Linus Pauling to Warren Weaver1
- Letter from Max Delbruck, California Institute of Technology to Michael Heidelberger1
- Letter from Pierre Lecomte du Nouy, Societe Philomathique de Paris to Oswald T. Avery1
- Letter from Ralph M. Waters to Virginia Apgar1
- Letter from Rudolph J. Anderson to Florence R. Sabin1
- Letter from Virginia Apgar to F. W. Clement1
- Notecard with photo of the yellow fever laboratory in Rio de Janeiro, and inset photos of rhesus monkeys in lower corners1