- Letter from Alvin J. Clark to Joshua Lederberg1
- Letter from Anonymous to Joshua Lederberg1
- Letter from Arthur Kornberg to Francis Crick1
- Letter from Brian D. Pate, Simon Fraser University to Marshall W. Nirenberg1
- Letter from C. H. Waddington to Francis Crick1
- Letter from Clifton Daniel, New York Times to Joshua Lederberg1
- Letter from Clive C. Spicer to Joshua Lederberg1
- Letter from D. Lazare, Syntex Laboratories to Joshua Lederberg1
- Letter from David Rittenberg, I. Rabi, Robert Hofstadter, Maurice Goldhaber, and Louis F. Fieser to Joshua Lederberg1
- Letter from Donald W. Morrison to Joshua Lederberg1
- Letter from Donald West King to Marshall W. Nirenberg1
- Letter from Edward L. Tatum to David Rockefeller1
- Letter from Edwin W. Amyes to Joshua Lederberg1
- Letter from Elliott C. Levinthal to Harold Brown, Pentagon1
- Letter from Emile Zuckerkandl to Joshua Lederberg1
- Letter from Erwin Friedman, Jewish Foundation for Retarded Children, Inc. to Joshua Lederberg1
- Letter from Eugene Garfield to The Philadelphia Inquirer1
- Letter from Francis Crick to C. H. Waddington1
- Letter from Francis Crick to H. Gobind Khorana1
- Letter from Francis Crick to Jacques Monod1