11. 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)
12. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 1 March 1931 Subject(s): ChromosomesGeneticsGenes, Plant Archival Collection: The Barbara McClintock Papers (Profiles in Science)
13. Letter from Charles R. Burnham to Barbara McClintock Publication: Produced: 23 January 1931 Subject(s): Zea maysChromosomesFellowships and Scholarships Archival Collection: The Barbara McClintock Papers (Profiles in Science)