1. Letter from Joshua Lederberg to Gardner Middlebrook Publication: Produced: 7 April 1954 Subject(s): Drug Resistance, MicrobialMutationMycobacterium Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Joshua Lederberg to Gardner Middlebrook Publication: Produced: 11 December 1956 Subject(s): Drug Resistance, MicrobialMutation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)