21. Letter from Joshua Lederberg to U. Winkler Publication: Produced: 27 October 1986 Subject(s): Escherichia coli Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
22. Letter from Samuel J. Ajl to Joshua Lederberg Publication: Produced: 21 September 1949 Subject(s): Cell Culture TechniquesEscherichia coliMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
23. Letter from Ernst H. Beutner to Joshua Lederberg Publication: Produced: 7 October 1950 Subject(s): Escherichia coliCell Culture Techniques Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
24. Letter from Seymour S. Cohen to Joshua Lederberg Publication: Produced: 4 May 1948 Subject(s): Escherichia coliResearch Design Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
25. Letter from Paul Berg to Donald S. Fredrickson Publication: Produced: 17 December 1979 Subject(s): DNA, RecombinantEscherichia coli Archival Collection: The Paul Berg Papers (Profiles in Science)
26. 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)
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 Raymond L. Latarjet Publication: Produced: 30 July 1950 Subject(s): Cell Culture TechniquesEscherichia coli Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
29. Letter from Joshua Lederberg to Raymond L. Latarjet Publication: Produced: 20 November 1953 Subject(s): Escherichia coliGenetics, Microbial Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
30. Letter from Joshua Lederberg to Michael Doudoroff Publication: Produced: 9 March 1948 Subject(s): Escherichia coliGenetics, MicrobialMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)