- Letter from David Perkins to Joshua Lederberg1
- Letter from Dennis H. Smith to Joshua Lederberg1
- Letter from Edwin C. Whitehead, Whitehead Associates, Inc. to Joshua Lederberg1
- Letter from Elizabeth E. Chotin, Fund for Integrative Biomedical Research to Joshua Lederberg2
- Letter from Ephraim Katchalski-Katzir, Tel Aviv University to Joshua Lederberg1
- Letter from Erhard Geissler to Joshua Lederberg1
- Letter from Ernest L. Abel, Behavioral Teratology Society to Joshua Lederberg1
- Letter from Ernst Friedheim to Joshua Lederberg2
- Letter from Estelle Gilson to Joshua Lederberg1
- Letter from Eunice Kennedy Shriver, Special Olympics to C. Everett Koop1
- Letter from Frank Press, National Academy of Sciences to Joshua Lederberg1
- Letter from George F. Cahill Jr to Daniel Nathans1
- Letter from George Haessler to Joshua Lederberg1
- Letter from Haim Ben-Shahar, Tel Aviv University to Joshua Lederberg1
- Letter from Harold Varmus to James D. Watson, Cold Spring Harbor Laboratory1
- Letter from Harold Varmus to Marilyn Kozak, University of Pittsburgh1
- Letter from Harold Varmus to Philip Leder, Harvard Medical School1
- Letter from Harold Varmus to Richard Lerner, Scripps Clinic and Research Foundation1
- Letter from Harold Varmus to Robert A. Weinberg, Massachusetts Institute of Technology1
- Letter from Harold Varmus to the Passano Foundation1