11. Memorandum from Barbara McClintock to William L. Brown Publication: Produced: February 1962 Subject(s): ChromosomesGeneticsGenes, PlantZea mays Archival Collection: The Barbara McClintock Papers (Profiles in Science)
12. Letter from Barbara McClintock to William L. Brown Publication: Produced: 9 August 1966 Subject(s): ChromosomesZea maysMexicoCentral AmericaSouth America Archival Collection: The Barbara McClintock Papers (Profiles in Science)
13. Letter from Barbara McClintock to William L. Brown Publication: Produced: 19 January 1969 Subject(s): DNAChromosomes Archival Collection: The Barbara McClintock Papers (Profiles in Science)