Titles
- Letter from Edward L. Tatum to Albert F. Blakeslee1
- Letter from Edward L. Tatum to George W. Beadle5
- Letter from Edward L. Tatum to Joshua Lederberg1
- Letter from Evelyn Witkin to Joshua Lederberg2
- Letter from Florence R. Sabin to Gertrude Sweeney1
- Letter from Florence R. Sabin to M. L. Cummins1
- Letter from Francis J. Ryan to Joshua Lederberg5
- Letter from Frank Stodola to Joshua Lederberg1
- Letter from Frederick S. Hammett to Joshua Lederberg1
- Letter from Fritz Kauffmann to Joshua Lederberg1
- Letter from George W. Beadle to Edward L. Tatum4
- Letter from George W. Beadle to Joshua Lederberg3
- Letter from Hans Ris to Joshua Lederberg1
- Letter from Harold E. Finley to Joshua Lederberg1
- Letter from Harold G. Thompson, New York State Education Department to Joshua Lederberg1
- Letter from Harold P. Morris, National Institutes of Health to Joshua Lederberg1
- Letter from Harriett Ephrussi-Taylor to Joshua Lederberg1
- Letter from Henry Platt to Joshua Lederberg3
- Letter from Henry Swan to his father1
- Letter from I. E. Newsom to Florence R. Sabin1