Titles
- Letter from Joshua Lederberg to Frank Stodola8
- Letter from Joshua Lederberg to Kenneth Mather8
- Letter from Joshua Lederberg to Michael Doudoroff8
- Letter from Luca Cavalli-Sforza to Joshua Lederberg8
- Letter from Raymond R. Roepke, American Cyanamid Company to Joshua Lederberg8
- Letter from Tracy M. Sonneborn to Max Delbruck8
- Letter from Evelyn Witkin to Joshua Lederberg7
- Letter from Kenneth Mather to Joshua Lederberg7
- Letter from Linus Pauling to Warren Weaver7
- Letter from Michael Doudoroff to Joshua Lederberg7
- Letter from P. R. Edwards to Joshua Lederberg7
- Letter from Robert Guthrie to Joshua Lederberg7
- Letter from Sol Spiegelman to Tracy M. Sonneborn7
- Letter from George W. Beadle to Edward L. Tatum6
- Letter from Joshua Lederberg to Harriett Ephrussi-Taylor6
- Letter from Joshua Lederberg to P. R. Edwards6
- Letter from Joshua Lederberg to Ralph G. Meader6
- Letter from Joshua Lederberg to Robert Guthrie6
- Letter from Leo Szilard to Joshua Lederberg6
- Letter from Mary Lasker to Florence Mahoney6