1. Letter from Barbara McClintock to Joshua Lederberg Publication: Produced: 8 November 1948 Subject(s): Recombination, GeneticRing ChromosomesCrossing Over, Genetic Archival Collection: The Barbara McClintock Papers (Profiles in Science)
2. Letter from Barbara McClintock to Elizabeth H. Blackburn Publication: Produced: 11 March 1983 Subject(s): Ring ChromosomesTelomereChromosome Breakage Archival Collection: The Barbara McClintock Papers (Profiles in Science)