1. Letter from Joshua Lederberg to Mary B. Mitchell Publication: Produced: 22 October 1954 Subject(s): Cell Culture TechniquesYeastsMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Mary B. Mitchell to Joshua Lederberg Publication: Produced: 29 October 1954 Subject(s): Cell Culture TechniquesYeasts Archival Collection: The Joshua Lederberg Papers (Profiles in Science)