- Letter from Elisa D. Harris, The Brookings Institution to Joshua Lederberg1
- Letter from Eric Thurschwell, Institute for Scientific Information to Bernard D. Davis1
- Letter from Eugene Garfield, Institute for Scientific Information to Bernard D. Davis1
- Letter from Frank Press, National Academy of Sciences to Joshua Lederberg1
- Letter from George T. Mazuzah, National Science Foundation to Joshua Lederberg1
- Letter from Georgio Bernardi to Maxine Singer1
- Letter from Greg Tombline to Vittorio Sgaramella2
- Letter from Howard H. Hiatt to Maxine Singer1
- Letter from J. Michael Bishop, Marc Kirschner, Elizabeth Marincola, and Harold Varmus to Paul Berg, Donald D. Brown, and Maxine Singer1
- Letter from Jennifer Seymour Whitaker, Council on Foreign Relations to Joshua Lederberg1
- Letter from John J. Miller to Joshua Lederberg1
- Letter from John M. Ferriter, Department of the Army to Joshua Lederberg1
- Letter from John Steinbruner, Committee on International Security and Arms Control (CISAC) to Joshua Lederberg1
- Letter from John Steinbruner, The Brookings Institution to Joshua Lederberg1
- Letter from John Steinbruner, The Brookings Institution to W. K. H. Panofsky1
- Letter from Joshua Lederberg [to several of his colleagues]1
- Letter from Joshua Lederberg and W. K. H. Panofsky to Vadim Ivanov and Evgeniy Velikhov, Academy of Sciences, U.S.S.R.1
- Letter from Joshua Lederberg and William T. Golden, Carnegie Commission on Science, Technology & Government to Jack Rosenthal [Letter to the Editor of the New York Times]1
- Letter from Joshua Lederberg to A. Coda1
- Letter from Joshua Lederberg to A. J. Spear1