21. Letter from Joshua Lederberg to Gordon Allen Publication: Produced: 6 January 1950 Subject(s): MutationRecombination, Genetic Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
22. Letter from Joshua Lederberg to Gordon Allen Publication: Produced: 11 August 1950 Subject(s): Genetics, MicrobialMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
23. Letter from Alfred E. Mirsky to Joshua Lederberg Publication: Produced: 31 October 1972 Subject(s): Transformation, GeneticMutationHistory of Medicine Archival Collection: The Oswald T. Avery Collection (Profiles in Science)
24. Letter from J. Oliver Lampen, American Cyanamid Company to Joshua Lederberg Publication: Produced: 21 November 1945 Subject(s): Escherichia coliMutationResearch Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
25. Letter from Joshua Lederberg to J. Oliver Lampen Publication: Produced: 8 August 1946 Subject(s): MutationTerminology as Topic Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
26. Letter from Raymond L. Latarjet to Joshua Lederberg Publication: Produced: 8 December 1949 Subject(s): Cell Culture TechniquesMutationRadiation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
27. Letter from Joshua Lederberg to Raymond L. Latarjet Publication: Produced: 12 April 1949 Subject(s): Cell Culture TechniquesEscherichia coliLysogenyMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
28. Letter from Joshua Lederberg to Seymour Lederberg Publication: Produced: 27 April 1949 Subject(s): MutationUltraviolet RaysMentors Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
29. Letter from Joshua Lederberg to Michael Doudoroff Publication: Produced: 28 April 1950 Subject(s): Genetics, MicrobialMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
30. Letter from D. Lewis to Joshua Lederberg Publication: Produced: 25 October 1948 Subject(s): GeneticsMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)