- Letter from Charles Yanofsky to Joshua Lederberg1
- Letter from Chen-Lu Tsou to Joshua Lederberg1
- Letter from Christian B. Anfinsen to Henry Margenau1
- Letter from Christian B. Anfinsen to Mark L. Pearson1
- Letter from Christian B. Anfinsen to Philip Leder1
- Letter from Christian B. Anfinsen to President of Turkey, Prime Minister of Turkey1
- Letter from Christian B. Anfinsen to Rudolph Kuznetsov, Andrei A. Gromyko, Edward Shevardnadze, G. I. Marchuk1
- Letter from Christian B. Anfinsen, Libby Anfinsen to Michael Sela1
- Letter from Committee of Concerned Scientists, Inc. (re: Vladimir Raiz)1
- Letter from Daniel E. Koshland, Jr., Science Magazine to Joshua Lederberg1
- Letter from Daniel L. Hartl to Joshua Lederberg1
- Letter from David J. Weatherall to Victor A. McKusick1
- Letter from David M. Abshire, Center for Strategic and International Studies to Joshua Lederberg1
- Letter from Debra Jan Bibel to Joshua Lederberg1
- Letter from Elie Wiesel to Joshua Lederberg1
- Letter from Emilio Weiss to Joshua Lederberg1
- Letter from Ernst Friedheim to Joshua Lederberg1
- Letter from G. J. V. Nossal to Joshua Lederberg1
- Letter from G.B. Marini-Bettolo, Pontifical Academy of Sciences to Marshall W. Nirenberg1
- Letter from Guillermo Soberon, National University of Mexico to Joshua Lederberg1