Titles
- Letter from Christian B. Anfinsen to Marshall W. Nirenberg1
- Letter from Christoph Scholtissek to Joshua Lederberg1
- Letter from Clarabell Presley to Henry Swan1
- Letter from Clarence Dennis to Curtis Horton Baylor1
- Letter from Courtenay Bartholomew to Joshua Lederberg1
- Letter from Cyril Ponnamperuma, Institute of Fundamental Studies, Sri Lanka to Joshua Lederberg1
- Letter from David H. Hubel to Marshall W. Nirenberg1
- Letter from David Kristofferson to Victor A. McKusick1
- Letter from David Talmage to Joshua Lederberg1
- Letter from Debra S. Goldman-Wohl to Joshua Lederberg1
- Letter from Domingo L. Siazon, Jr., United Nations Industrial Development Organization to Joshua Lederberg1
- Letter from Efraim Racker, Cornell University to Harold Varmus1
- Letter from Eric A. Barnard to Marshall W. Nirenberg1
- Letter from Eric J. Nestler to Marshall W. Nirenberg1
- Letter from F. James Rutherford to Maxine Singer1
- Letter from Frank Jacoby and Doris Storm to Joshua Lederberg1
- Letter from Harold Varmus to Bill McGuire, United States Information Agency1
- Letter from Harold Varmus to Efraim Racker, Cornell University1
- Letter from Henry Margenau to Christian B. Anfinsen1
- Letter from Henry Margenau, Yale University to Marshall W. Nirenberg1