Titles
- Letter from Florence B. Seibert to Florence R. Sabin2
- Letter from Florence R. Sabin to Catharine Macfarlane2
- Letter from Florence R. Sabin to Charles A. Doan2
- Letter from Florence R. Sabin to Rudolph J. Anderson2
- Letter from George W. Beadle to Edward L. Tatum2
- Letter from Karl A. Connell to Virginia Apgar2
- Letter from MacGregor Instrument Company to Michael E. DeBakey and William H. Gillentine2
- Letter from Oswald T. Avery to Minnie Wandell2
- 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 A. T. McCormack to Thomas Parran1
- Letter from Alan Gregg to Elton Mayo1
- 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