Titles
- Letter from Neal B. Groman to Joshua Lederberg5
- Letter from Niccolo Visconti to Joshua Lederberg5
- Letter from O. O. R. Schwidetzky to Michael E. DeBakey5
- Letter from Olavi Makela to Joshua Lederberg5
- Letter from Otto E. Landman to Joshua Lederberg5
- Letter from Owen H. Wangensteen to Clarence Dennis5
- Letter from Paul Berg to Daniel Nathans5
- Letter from Paul Berg to Donald S. Fredrickson5
- Letter from Paul F. Glenn to Joshua Lederberg5
- Letter from Perry W. Wilson to Joshua Lederberg5
- Letter from Ralph Mellon to Joshua Lederberg5
- Letter from Reese Vaughn to Joshua Lederberg5
- Letter from Richard L. Masland to Joshua Lederberg5
- Letter from Richard M. Pearce to Alan Gregg5
- Letter from Robert C. Olby to Joshua Lederberg5
- Letter from Robert W. Briggs to Joshua Lederberg5
- Letter from Roger S. Mitchell, University of Colorado Medical Center to Joshua Lederberg5
- Letter from Roy D. Schmickel to Daniel Nathans5
- Letter from Sara Gerling to Joshua Lederberg5
- Letter from Sidney Raffel to Joshua Lederberg5