Titles
- Letter from Edward Novitski to Joshua Lederberg1
- Letter from Ernest Borek to Joshua Lederberg1
- Letter from Esther Lederberg to Manuel V. Ortega1
- Letter from Ethel W. Silver to Joshua Lederberg1
- Letter from Eugene M. Bricker to Michael E. DeBakey1
- Letter from F. M. Burnet, University of Melbourne to Michael Heidelberger1
- Letter from Federico J. Herrero to Joshua Lederberg1
- Letter from Francis Crick to H. Gobind Khorana1
- Letter from Francis Crick to James D. Watson4
- Letter from Francis Crick to James D. Watson (and notes concerning Watson's book, "The Double Helix")1
- Letter from Francis Crick to Marshall W. Nirenberg2
- Letter from Francis Crick to Nathan M. Pusey, Harvard University2
- Letter from Francis Crick to Robert W. Holley1
- Letter from Francis Crick to Sewell Champe2
- Letter from Francis Crick to Thomas J. Wilson, Harvard University Press1
- Letter from Francois Jacob to Joshua Lederberg1
- Letter from Frank B. Rogers to Joshua Lederberg2
- Letter from Fred L. Soper to Leona Baumgartner1
- Letter from Fred L. Soper to Pedro Galindo1
- Letter from Fred R. Harris to Joshua Lederberg1