Titles
- Letter from M. Demerec to Tracy M. Sonneborn20
- Letter from Torbjorn Caspersson to Joshua Lederberg20
- Memorandum from Roland L. Peterson to United States. Bureau of Health Resources Development20
- Letter from Martin M. Kaplan, World Health Organization to Joshua Lederberg19
- Letter from Aleck Bernstein to Joshua Lederberg18
- Letter from Barbara J. Bachmann to Joshua Lederberg18
- Letter from Hilary Koprowski to Joshua Lederberg18
- Letter from Kimball Atwood to Joshua Lederberg18
- Letter from Peter Medawar to Joshua Lederberg18
- Letter from Tracy M. Sonneborn to M. Demerec18
- Letter from Yukinori Hirota to Joshua Lederberg18
- Letter from A. D. Hershey to Joshua Lederberg17
- Letter from Ann Landers to Joshua Lederberg17
- Letter from Charles R. Drew to Lenore (Robbins) Drew17
- Letter from Florence R. Sabin to Mary Sabin17
- Letter from Frank Fenner to Joshua Lederberg17
- Letter from Stanfield Rogers to Joshua Lederberg17
- Letter from Aaron Klug to Francis Crick16
- Letter from Helen (Byers) Bernstein to Joshua Lederberg16
- Postcard from Edward L. Tatum to Joshua Lederberg16