1. Letter from Melvin Cohn, Washington University School of Medicine to Michael Heidelberger Publication: Produced: 20 November 1956 Subject(s): Immune SeraGalactosidases Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
2. Letter from Joshua Lederberg to Jacques Monod Publication: Produced: 27 January 1948 Subject(s): Escherichia coliGenetics, MicrobialGalactosidases Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
3. Letter from Joshua Lederberg to Jacques Monod Publication: Produced: 27 August 1956 Subject(s): MutationGalactosidases Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
