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Titles
- Letter from Barbara McClintock to Charles R. Burnham10
- Letter from Franklin Halpin to Lawrence Kolb2
- Letter from Alan Gregg to H. H. Dale1
- Letter from Alan Gregg to Hugh Crichton-Miller1
- Letter from Alan Gregg to his wife1
- Letter from Carl E. Buck to Louis Dublin1
- Letter from Charles R. Burnham to Barbara McClintock1
- Letter from Claude Forkner to Florence R. Sabin1
- Letter from Florence R. Sabin to Rudolph J. Anderson1
- Letter from Good Housekeeping Magazine to Florence R. Sabin1
- Letter from H. H. Dale to Alan Gregg1
- Letter from Helen Keller to Florence R. Sabin1
- Letter from Henry Swan to his father1
- Letter from John McMullan to Lawrence Kolb1
- Letter from Marjory Stephenson to Walter Fletcher1
- Letter from Oswald T. Avery to Minnie Wandell1
- Letter from Rudolph J. Anderson to Florence R. Sabin1
- Letter from Simon Flexner to Florence R. Sabin1
- Letter from Walter Fletcher to Marjory Stephenson1
- Letter to Henry Swan from his father1