Titles
- Letter from Frank Fenner to Joshua Lederberg2
- Letter from Hewson Swift to Joshua Lederberg2
- Letter from Hilary Koprowski to Joshua Lederberg2
- Letter from Hugo Boyko, World Academy of Art and Science to Joshua Lederberg2
- Letter from John L. Fuller to Victor A. McKusick2
- Letter from John R. Platt to Joshua Lederberg2
- Letter from John Z. Bowers to Joshua and Esther Lederberg2
- Letter from Koert Gerzon to Joshua Lederberg2
- Letter from Merel Harmel to Clarence Dennis2
- Letter from Norman H. Horowitz to Joshua Lederberg2
- Letter from Raymond R. Roepke, American Cyanamid Company to Joshua Lederberg2
- Letter from Seymour S. Cohen to Joshua Lederberg2
- Letter from Stanfield Rogers to Joshua Lederberg2
- Letter from Tetsuo Iino to Joshua Lederberg2
- Letter from Tracy M. Sonneborn to Joshua Lederberg2
- Letter from Vernon Bryson to Joshua Lederberg2
- Letter from Victor A. McKusick to John L. Fuller2
- Letter from Xandra Breakefield to Marshall W. Nirenberg2
- Circular letter from Hugo Boyko, World Academy of Art and Science1
- Letter from A. B. Sirbu to Joshua Lederberg1