Titles
- Letter from H. Hugh Fudenberg to Joshua Lederberg3
- Letter from H. Keffer Hartline to Joshua Lederberg3
- Letter from Hans L. Kornberg to Joshua Lederberg3
- Letter from Harold Amos to Joshua Lederberg3
- Letter from Harold Varmus to Mike Fried, Imperial Cancer Research Fund Laboratories3
- Letter from Harriett Ephrussi-Taylor to Oswald T. Avery3
- Letter from Henry F. Epstein to Joshua Lederberg3
- Letter from Henry P. Treffers to Joshua Lederberg3
- Letter from Henry Platt to Joshua Lederberg3
- Letter from Henry Swan to Clarabell Presley3
- Letter from Henry Swan to his father3
- Letter from Herbert B. Pahl to United States. Regional Medical Programs Service and United States. Department of Health, Education, and Welfare3
- Letter from Herschel Roman, Annual Review of Genetics to Joshua Lederberg3
- Letter from Hewson Swift to Joshua Lederberg3
- Letter from Hideo Nakayama to Joshua Lederberg3
- Letter from Hilary Koprowski to Joshua and Esther Lederberg3
- Letter from Hugh Cumming to Lawrence Kolb3
- Letter from I. C. Gunsalus to Joshua Lederberg3
- Letter from Ingrith Deyrup to Joshua Lederberg3
- Letter from Irwin M. Arias to Joshua Lederberg3