Titles
- Letter from Oswald T. Avery to Minnie Wandell2
- Letter from R. A. Vonderlehr to Lawrence Kolb2
- Letter from Richard Willstatter to Michael Heidelberger2
- Letter from Robert S. Cunningham to Florence R. Sabin2
- Letter from Rudolph J. Anderson to Florence R. Sabin2
- Letter from Simon Flexner to Florence R. Sabin2
- Letter from Virginia Apgar to Allen O. Whipple2
- Letter from Alan Gregg to David L. Edsall1
- Letter from Alan Gregg to Elton Mayo1
- Letter from Alan Gregg to F. Elisabeth Crowell1
- Letter from Alan Gregg to H. H. Dale1
- Letter from Alan Gregg to Harvey Cushing1
- Letter from Alan Gregg to Hugh Crichton-Miller1
- Letter from Alan Gregg to Leonard Colebrook1
- Letter from Alan Gregg to Mark May1
- Letter from Alan Gregg to William Palmer1
- Letter from Alexander Makinsky to Alan Gregg1
- Letter from Allen O. Whipple to Virginia Apgar1
- Letter from Austin Brues to Clarence Dennis1
- Letter from Carl E. Buck to Louis Dublin1