Titles
- Letter from Clifford B. Purves to Joshua Lederberg1
- Letter from D. Carleton Gajdusek, The Children's Hospital (Cincinnati, Ohio) to Michael Heidelberger2
- Letter from D. Lewis to Joshua Lederberg1
- Letter from David M. Bonner to Joshua Lederberg5
- Letter from David Rittenberg to Joshua Lederberg1
- Letter from Donald S. Fredrickson to C. Arthur and Blanche Fredrickson2
- Letter from Doris I. Jones to Joshua Lederberg1
- Letter from Edna Montgomery to Joshua Lederberg1
- Letter from Edna Montgomery, Corn Industries Research Foundation to Joshua Lederberg1
- Letter from Edward L. Tatum to Joshua Lederberg1
- Letter from Ellen E. Kann to Joshua Lederberg1
- Letter from Emil L. Smith to Joshua Lederberg1
- Letter from Ernst W. Caspari to Joshua Lederberg2
- Letter from Eunice T. Miner, New York Academy of Sciences to Joshua Lederberg1
- Letter from F. M. Burnet to Joshua Lederberg1
- Letter from Felix Haurowitz to Michael Heidelberger1
- Letter from Florence Mahoney to Mary Lasker1
- Letter from Francis J. Ryan to Joshua Lederberg1
- Letter from Frank Stodola to Joshua Lederberg2
- Letter from Fritz Kauffmann to Joshua Lederberg2