Titles
- Letter from A. Bruce Bishop, New York State Energy Research and Development Authority to Joshua Lederberg1
- Letter from A. D. Hershey to Joshua Lederberg4
- Letter from A. J. Van Rensburg to Joshua Lederberg1
- Letter from A. T. Ganesan to Joshua Lederberg1
- Letter from Aaron J. Shatkin to Daniel Nathans1
- Letter from Aaron Klug to Francis Crick14
- Letter from Aaron Klug to Philip Siekevitz1
- Letter from Aaron Novick to Joshua Lederberg5
- Letter from Aaron Wildavsky to Joshua Lederberg1
- Letter from Aaron Wildavsky, Russell Sage Foundation to Joshua Lederberg2
- Letter from Abraham A. Ribicoff to Joshua Lederberg3
- Letter from Abraham Feinberg, American Committee for the Weizmann Institute of Science to Joshua Lederberg2
- Letter from Abraham Penzer to Joshua Lederberg1
- Letter from Abraham White to Joshua Lederberg2
- Letter from Adlai E. Stevenson, United States Senate to Joshua Lederberg1
- Letter from Adrian J. Gibbs to Joshua Lederberg1
- Letter from Aharon Katzir-Katchalski to Albert B. Sabin, Weizmann Institute of Science1
- Letter from Akira Kimura to Joshua Lederberg1
- Letter from Alain F. Corcos to Joshua Lederberg1
- Letter from Alain Merieux to Joshua Lederberg2