Titles
- Letter from Florence R. Sabin to Simon Flexner4
- Letter from George McCoy to Lena Sadler1
- Letter from Gulli Lindh Muller to Florence R. Sabin1
- Letter from Howard Potter to Lawrence Kolb4
- Letter from James N. Lightner to Lawrence Kolb1
- Letter from John H. Remig to Lawrence Kolb1
- Letter from John Remig to Lawrence Kolb1
- Letter from Karl Landsteiner to Michael Heidelberger1
- Letter from Lawrence Kolb to James N. Lightner1
- Letter from Louise Pearce to Michael Heidelberger1
- Letter from Peking Union Medical College to Florence R. Sabin1
- Letter from Phoebus A. Levene, Rockefeller Institute for Medical Research to Michael Heidelberger1
- Letter from Randolph Faries to Lawrence Kolb1
- Letter from Richard M. Pearce to Alan Gregg2
- Letter from Richmond Hobson to C. Bascom Slemp1
- Letter from Richmond Hobson to G. W. McCoy1
- Letter from Robert S. Cunningham to Florence R. Sabin1
- Letter from Rudolph J. Anderson to Florence R. Sabin7
- Letter from Simon Flexner to Florence R. Sabin3
- Letter from Simon Flexner to Michael Heidelberger1