Titles
- Letter from Joshua Lederberg to Robert E. and Mari Wright3
- Letter from Joshua Lederberg to Robert Michels3
- Letter from Joshua Lederberg to Robert Noyce, Intel Corporation3
- Letter from Joshua Lederberg to Robert S. Morison3
- Letter from Joshua Lederberg to Robert W. Briggs3
- Letter from Joshua Lederberg to Roderick K. Clayton3
- Letter from Joshua Lederberg to Roger M. Herriott3
- Letter from Joshua Lederberg to Roger S. Mitchell, University of Colorado Medical Center3
- Letter from Joshua Lederberg to Royston C. Clowes3
- Letter from Joshua Lederberg to Rudolf F. Vollman3
- Letter from Joshua Lederberg to Ruggero Ceppellini3
- Letter from Joshua Lederberg to Russell Wiggins, Washington Post3
- Letter from Joshua Lederberg to Seymour Lederberg3
- Letter from Joshua Lederberg to Sofia "Topsy" (Simmonds) Fruton3
- Letter from Joshua Lederberg to Stan Shapiro3
- Letter from Joshua Lederberg to Stewart A. Koser3
- Letter from Joshua Lederberg to Sydney Brenner3
- Letter from Joshua Lederberg to Tetsu Nakayama3
- Letter from Joshua Lederberg to The Committee on Handbook of Biological Data3
- Letter from Joshua Lederberg to Thomas M. Rivers3