- Letter from Fred Jerome, Scientists' Institute for Public Information to Joshua Lederberg1
- Letter from Fred T. Schultz, Nicholas Turkey Breeding Farms, Inc. to Joshua Lederberg1
- Letter from Fred T. Schultz, Nicholas Turkey Breeding Farms, Inc. to Ronald Cape1
- Letter from Frederick C. Robbins, Institute of Medicine to Joshua Lederberg1
- Letter from George B. Brown to Joshua Lederberg1
- Letter from George B. Kistiakowsky, Council for a Livable World to Joshua Lederberg1
- Letter from George C. McGhee, Resources for the Future to Joshua Lederberg1
- Letter from George G. Somjen to Joshua Lederberg1
- Letter from George J. Cardinale, Roche Institute of Molecular Biology to Joshua Lederberg1
- Letter from George W. Beadle to Barbara McClintock1
- Letter from Gerald Freund, MacArthur Foundation to Joshua Lederberg1
- Letter from Glenn A. Rice and Roger D. Clark to Joshua Lederberg1
- Letter from Grace Chi, Bethesda Research Laboratories to Joshua Lederberg1
- Letter from H. Bentley Glass to Joshua Lederberg1
- Letter from Hans Bethe, Bulletin of the Atomic Scientists to Joshua Lederberg1
- Letter from Harold Varmus to Hisayuki Yamamura, Japan Medical Research Foundation1
- Letter from Harold Varmus to Lawrence A. Donehower, National Institutes of Health1
- Letter from Harold Varmus to Yoji Ikawa, Japanese Foundation for Cancer Research1
- Letter from Harris B. Shumacker to Clarence Dennis1
- Letter from Harry B. Demopoulos to James Ramey, Formaldehyde Institute1