Titles
- Letter from A. M. James to Joshua Lederberg1
- Letter from A. M. Pappenheimer, Jr. to Alden H. Emery, American Chemical Society1
- Letter from A. M. Pappenheimer, Jr. to Joshua Lederberg1
- Letter from A. R. Gopal-Ayengar to Joshua Lederberg3
- Letter from A. R. Gopal-Ayengar to Joshua and Esther Lederberg1
- Letter from A. T. Ganesan to Joshua Lederberg3
- Letter from A. T. Wilson to Joshua Lederberg1
- Letter from Aaron Klug to F. C. Bawden1
- Letter from Aaron Klug to Francis Crick1
- Letter from Aaron Klug to Wendell M. Stanley1
- Letter from Aaron Novick to Esther Lederberg2
- Letter from Aaron Novick to Joshua Lederberg49
- Letter from Aaron Novick to Joshua and Esther Lederberg2
- Letter from Aaron and Jane Novick to Joshua and Esther Lederberg2
- Letter from Abe Eisenstark to Joshua Lederberg3
- Letter from Abraham Penzer to Joshua Lederberg1
- Letter from Abraham White to Joshua Lederberg4
- Letter from Adelaide E. Evenson to Joshua Lederberg1
- Letter from Adlai E. Stevenson to Joshua Lederberg1
- Letter from Adrian Kantrowitz to Jerome J. Suran2