1. Letter from Seymour S. Cohen to Joshua Lederberg Publication: Produced: 4 May 1948 Subject(s): Escherichia coliResearch Design Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Joshua Lederberg to Mario U. Dianzani Publication: Produced: 9 January 1951 Subject(s): Escherichia coliMutationResearch Design Archival Collection: The Joshua Lederberg Papers (Profiles in Science)