1. Letter from Joshua Lederberg to Werner K. Maas Publication: Produced: 16 December 1950 Subject(s): Recombination, GeneticResearch Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Joshua Lederberg to Werner K. Maas Publication: Produced: 8 July 1951 Subject(s): Genetics, MicrobialRecombination, GeneticResearch Design Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
3. Letter from Joshua Lederberg to Werner K. Maas Publication: Produced: 14 April 1952 Subject(s): Recombination, Genetic Archival Collection: The Joshua Lederberg Papers (Profiles in Science)