Titles
- Letter from Boris Rotman to Joshua Lederberg2
- Letter from Britton Chance to Joshua Lederberg1
- Letter from Bruce W. Holloway to Joshua and Esther Lederberg1
- Letter from Bruno B. Rossi to Joshua Lederberg1
- Letter from Carl Djerassi to Joshua Lederberg2
- Letter from Carl Djerassi, Syntex Laboratories to Joshua Lederberg1
- Letter from Carl-Goran Heden and Lars Rutberg to Joshua Lederberg1
- Letter from Carl-Goran Heden to Joshua Lederberg1
- Letter from Charles C. Brinton, Jr. to Joshua Lederberg1
- Letter from Christian B. Anfinsen to Joshua Lederberg1
- Letter from Clark Foreman to Joshua Lederberg1
- Letter from Daniel Mazia to Joshua Lederberg3
- Letter from David R. Goddard to Joshua Lederberg1
- Letter from David Talmage to Joshua Lederberg1
- Letter from Detlev Wulf Bronk, National Academy of Sciences to Joshua Lederberg1
- Letter from Difco Laboratories to Joshua Lederberg1
- Letter from E. M. Kratz, Mono-Sol Corporation to Joshua Lederberg2
- Letter from Edouard Kellenberger to Joshua and Esther Lederberg1
- Letter from Edward A. Adelberg to Joshua Lederberg3
- Letter from Edward L. Ginzton to Ernest C. Pollard1