1. Letter from Werner K. Maas to Joshua Lederberg Publication: Produced: 19 June 1950 Subject(s): Cell Culture TechniquesMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Werner K. Maas to Joshua Lederberg Publication: Produced: 19 September 1952 Subject(s): Cell Culture TechniquesMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)