Titles
- Letter from A. I. Oparin to Joshua Lederberg1
- Letter from A. K. Bhattacharyya to Joshua Lederberg1
- Letter from Aaron Novick to Joshua Lederberg1
- Letter from Adrian Kantrowitz to Jack A. Cannon1
- Letter from Adrian Kantrowitz to Nelson H. Kraeft1
- Letter from Adrian Kantrowitz to Timothy Takaro1
- Letter from Albert Baird Hastings to Marshall W. Nirenberg1
- Letter from Albert L. Lehninger to Joshua Lederberg1
- Letter from Anne Messer to Marshall W. Nirenberg1
- Letter from Arthur J. Walker to Francis Crick, Leslie Barnett, Sydney Brenner, and R. J. Watts-Tobin1
- Letter from Arthur J. Walker to Marshall W. Nirenberg and J. Heinrich Matthaei1
- Letter from Arthur Kornberg to Robert K. Morton1
- Letter from Barbara McClintock to Curt Stern1
- Letter from Barbara McClintock to F. G. Brieger1
- Letter from Barbara McClintock to Harold Frank Robinson1
- Letter from Barbara McClintock to William L. Brown1
- Letter from Barry Commoner to Joshua Lederberg1
- Letter from Benjamin Draper, California Academy of Sciences to Joshua Lederberg1
- Letter from Bernardo A. Houssay, Instituto de Biologia y Medicina Experimental to Marshall W. Nirenberg1
- Letter from Boris Rotman to Ann Katharine Cook1