1. Letter from Gardner Middlebrook to Joshua Lederberg Publication: Produced: 1 April 1954 Subject(s): Drug Resistance, MicrobialMutationGenetics, Microbial Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. 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)
3. 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)
4. Letter from Joshua Lederberg to C. Phillip Miller Publication: Produced: 5 December 1951 Subject(s): Escherichia coliMutationDrug Resistance, Microbial Archival Collection: The Joshua Lederberg Papers (Profiles in Science)