Titles
- Letter from Victor A. McKusick to Harold Jeghers3
- Letter from Ward Pigman to Joshua Lederberg3
- Postcard from Salvador E. Luria to Joshua Lederberg3
- Letter from D. Carleton Gajdusek, The Children's Hospital (Cincinnati, Ohio) to Michael Heidelberger2
- Letter from Donald S. Fredrickson to C. Arthur and Blanche Fredrickson2
- Letter from Ernst W. Caspari to Joshua Lederberg2
- Letter from Frank Stodola to Joshua Lederberg2
- Letter from Fritz Kauffmann to Joshua Lederberg2
- Letter from J. R. Heller to Mary Lasker2
- Letter from Joshua Lederberg to Bernard D. Davis2
- Letter from Joshua Lederberg to Edna Montgomery2
- Letter from Joshua Lederberg to Evelyn Witkin2
- Letter from Joshua Lederberg to Frank Stodola2
- Letter from Joshua Lederberg to Howard B. Newcombe2
- Letter from Joshua Lederberg to Jack Edman2
- Letter from Joshua Lederberg to Jerald G. Wooley2
- Letter from Joshua Lederberg to Karl M. Jakob2
- Letter from Joshua Lederberg to Laurence H. Snyder2
- Letter from Joshua Lederberg to Leo Szilard2
- Letter from Joshua Lederberg to M. Stacey2