21. Letter from Barbara McClintock to Curt Stern Publication: Produced: 27 June 1937 Subject(s): Zea maysChromosomesCrossing Over, Genetic Archival Collection: The Barbara McClintock Papers (Profiles in Science)
22. A Correlation of Cytological and Genetical Crossing-Over in Zea Mays Publication: National Academy Press (U.S.), 1931 Subject(s): Zea maysCrossing Over, GeneticChromosomesMeiosis Archival Collection: The Barbara McClintock Papers (Profiles in Science)
23. 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)
24. 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)
25. A Correlation of Ring-Shaped Chromosomes with Variegation in Zea Mays Publication: National Academy Press (U.S.), 15 December 1932 Subject(s): Zea maysRing ChromosomesGenetic Markers Archival Collection: The Barbara McClintock Papers (Profiles in Science)
26. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 20 February 1930 Subject(s): Zea maysStaining and Labeling Archival Collection: The Barbara McClintock Papers (Profiles in Science)
27. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 6 February 1931 Subject(s): ChromosomesGenetics Archival Collection: The Barbara McClintock Papers (Profiles in Science)
28. 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)
29. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 11 April 1931 Subject(s): Zea maysChromosomes Archival Collection: The Barbara McClintock Papers (Profiles in Science)
30. Letter from Barbara McClintock to Charles R. Burnham Publication: Produced: 12 May 1931 Subject(s): ChromosomesZea maysGenetics Archival Collection: The Barbara McClintock Papers (Profiles in Science)