1. Letter from Joshua Lederberg to Cy Levinthal Publication: Produced: 13 September 1972 Subject(s): Recombination, GeneticHistory of MedicineArchives Archival Collection: The Oswald T. Avery Collection (Profiles in Science)
2. Letter from Joshua Lederberg to Marion Himes Publication: Produced: 14 September 1972 Subject(s): Recombination, GeneticHistory of Medicine Archival Collection: The Oswald T. Avery Collection (Profiles in Science)
3. Letter from Joshua Lederberg to L. C. Dunn Publication: Produced: 11 October 1972 Subject(s): Recombination, GeneticHistory of Medicine Archival Collection: The Oswald T. Avery Collection (Profiles in Science)
4. Letter from Joshua Lederberg to Gabriele Ehrlich Publication: Produced: 13 October 1972 Subject(s): History of MedicineRecombination, Genetic Archival Collection: The Oswald T. Avery Collection (Profiles in Science)