Titles
- Letter from Adrian Kantrowitz to Timothy Takaro1
- Letter from Adrianus Pijper to Joshua Lederberg1
- Letter from Aksel Faber to Joshua Lederberg1
- Letter from Alain Bussard to Joshua Lederberg2
- Letter from Alan Garen to H. Houston Merritt1
- Letter from Alan Garen to Joshua Lederberg1
- Letter from Albert B. Sabin, The Children's Hospital (Cincinnati, Ohio) to Joshua Lederberg1
- Letter from Albert Baird Hastings to Marshall W. Nirenberg1
- Letter from Albert I. Winegrad to Joshua Lederberg1
- Letter from Albert L. Lehninger to Joshua Lederberg1
- Letter from Albert Szent-Gyorgyi, Marine Biological Laboratory to Joshua Lederberg1
- Letter from Aldous Huxley to Joshua Lederberg1
- Letter from Alexander Bodi, Palo Alto Times to Joshua Lederberg4
- Letter from Alexander Rich to Francis Crick1
- Letter from Alfons Metzner to Joshua Lederberg2
- Letter from Alfred E. Mirsky to Edward L. Tatum1
- Letter from Alfred E. Mirsky to L. C. Dunn2
- Letter from Alfred Lindesmith to Lawrence Kolb1
- Letter from Alice C. Evans to Joshua Lederberg1
- Letter from Allan H. Brown to Joshua Lederberg1