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This article, co-authored by McClintock, expanded on her 1929 paper in the "Journal of Heredity." In it, she noted some of her observations of trisomics (the presence of an extra chromosome) that would evolve into her oft-cited 1931 paper with Harriet Creighton.
Periodical. McClintock, Barbara, and Henry E. Hill. "The Cytological Identification of the Chromosome Associated with the R-G Linkage Group in Zea Mays." Genetics 16, (March 1931): 175-190. Article. 16 Images.. Genetics