Titles
- Letter from Joshua Lederberg to the San Francisco Chronicle4
- Letter from Julien E. Mack to Joshua Lederberg4
- Letter from K. P. Wood to Joshua Lederberg4
- Letter from K. V. Kossikov to Joshua Lederberg4
- Letter from Kai O. Pedersen to Michael Heidelberger4
- Letter from Karl E. Karlson to Clarence Dennis4
- Letter from Kenneth W. Cooper to Joshua Lederberg4
- Letter from Kiyoshi Kurahashi to Joshua Lederberg4
- Letter from Lawrence Kolb to the Surgeon General4
- Letter from Leonard M. Elstad to John E. Fogarty4
- Letter from Lewis Hackett to Fred L. Soper4
- Letter from Linus Pauling to E. C. Kleiderer4
- Letter from Lloyd S. Etheredge to Joshua Lederberg4
- Letter from Louis S. Baron to Joshua and Esther Lederberg4
- Letter from M. Demerec to Erwin Chargaff4
- Letter from M. R. Irwin to Joshua Lederberg4
- Letter from Maclyn McCarty to Joshua Lederberg4
- Letter from Maclyn McCarty to Wendell M. Stanley4
- Letter from Margaret MacDonald to William Osler [Transcript]4
- Letter from Marguerite Stein to Florence R. Sabin4