1. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 4 April 1930 Subject(s): ChromosomesZea maysCrossing Over, GeneticCytogenetics Archival Collection: The Barbara McClintock Papers (Profiles in Science)
2. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 23 January 1930 Subject(s): Zea maysChromosomesCrossing Over, GeneticJob Satisfaction Archival Collection: The Barbara McClintock Papers (Profiles in Science)
3. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 12 March 1931 Subject(s): ChromosomesGenes, PlantCrossing Over, Genetic Archival Collection: The Barbara McClintock Papers (Profiles in Science)
4. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 25 September 1931 Subject(s): Zea maysChromosomesCrossing Over, Genetic Archival Collection: The Barbara McClintock Papers (Profiles in Science)
