Titles
- Letter from Mario U. Dianzani to Joshua Lederberg4
- Letter from Marshall W. Nirenberg to Francis Crick4
- Letter from Martin R. Pollock to Sol Spiegelman4
- Letter from Marvin L. Minsky to Joshua Lederberg4
- Letter from Maurice B. Visscher to Joshua Lederberg4
- Letter from Maurice H. F. Wilkins to Francis Crick4
- Letter from Maurice R. Green to Joshua Lederberg4
- Letter from Maurice R. Green, St. Luke's Hospital Center to Joshua Lederberg4
- Letter from Maxine Singer to Debi P. Burma4
- Letter from Michael E. DeBakey to William G. Reidy4
- Letter from Michael E. DeBakey to his father, Shaker4
- Letter from Michael G. P. Stoker to Paul Berg4
- Letter from N. W. Pirie, Rothamsted Experimental Station to Joshua Lederberg4
- Letter from Nicholas Johnson, Federal Communications Commission to Joshua Lederberg4
- Letter from Norman G. Anderson to Joshua Lederberg4
- Letter from Ole Maaloe to Joshua Lederberg4
- Letter from Otto Kandler to Joshua Lederberg4
- Letter from Paul Berg to Joshua Lederberg4
- Letter from Paul Berg to William J. Gartland4
- Letter from Paul N. McCloskey, Jr. to Joshua Lederberg4