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 Gardner Middlebrook to Joshua Lederberg Publication: Produced: 13 April 1954 Subject(s): Genetics, MicrobialTransformation, Genetic Archival Collection: The Joshua Lederberg Papers (Profiles in Science)