Titles
- Letter from Adrian Kantrowitz to Jerome J. Suran2
- Letter from Adrianus Pijper to Joshua Lederberg3
- Letter from Adrien Albert to Joshua Lederberg2
- Letter from Aizo Matsushiro to Joshua Lederberg1
- Letter from Alain Bussard to Joshua Lederberg2
- Letter from Alan B. Hackwell to Joshua Lederberg1
- Letter from Alan Garen to Joshua Lederberg8
- Letter from Alan Garen to Salvador E. Luria1
- Letter from Alan Gregg to A. Warren Stearns1
- Letter from Alan Gregg to Chase Mellen, Jr1
- Letter from Alan Gregg to Joshua Lederberg1
- Letter from Alan Gregg to Rajkumari Amrit Kaur1
- Letter from Alan Gregg to Senator Lister Hill1
- Letter from Alan Gregg to Speaker of the House Samuel Rayburn1
- Letter from Alan Gregg to William I. Myers1
- Letter from Alba Cavalli-Sforza to Esther Lederberg1
- Letter from Albert B. Sabin, The Children's Hospital (Cincinnati, Ohio) to Joshua Lederberg2
- Letter from Albert H. Coons to Joshua Lederberg2
- Letter from Albert Kelner to Joshua Lederberg2
- Letter from Albert P. Krueger to Joshua Lederberg2