1. 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)
2. 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)
3. Letter from Joshua Lederberg to Edward L. Tatum Publication: Produced: 19 September 1945 Subject(s): Cell Culture TechniquesEscherichia coliGenetics, Microbial Archival Collection: The Joshua Lederberg Papers (Profiles in Science)