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Titles
- Letter from Barbara McClintock to Charles R. Burnham4
- Letter from Roger S. Greene to Alan Gregg4
- Letter from Roy Sandidge to Lawrence Kolb3
- Letter from Alan Gregg to Roger S. Greene2
- Letter from Alan Gregg to his wife2
- Letter from F. Elisabeth Crowell to Alan Gregg2
- Letter from R. A. Vonderlehr to Lawrence Kolb2
- Letter from Alan Gregg to F. Elisabeth Crowell1
- Letter from Charles R. Drew [to the New Year]1
- Letter from Claude Forkner to Florence R. Sabin1
- Letter from E. E. Huber to Lawrence Kolb1
- Letter from George W. McCoy to Lawrence Kolb1
- Letter from Langdon White to Lawrence Kolb1
- Letter from Lawrence Kolb to Franklin Halpin1
- Letter from Lawrence Kolb to the Surgeon General1
- Letter from Oswald T. Avery to Minnie Wandell1
- Letter from Oswald T. Avery to Roy Avery1
- Letter from Simon Flexner to Florence R. Sabin1
- Letter from Taliaferro Clark to Lawrence Kolb1
- Letter from Wilbur A. Sawyer to Margaret Sawyer1