1. Memorandum to Marcus Rhoades (about the Ds Locus) [pages 1-25] Publication: Produced: January 1949 Subject(s): MutationChromosome BreakageGene ExpressionGenetics Archival Collection: The Barbara McClintock Papers (Profiles in Science)
2. Memorandum to Marcus Rhoades (about the Ds Locus) [pages 26-54] Publication: Produced: January 1949 Subject(s): MutationRing ChromosomesGene ExpressionGenetics Archival Collection: The Barbara McClintock Papers (Profiles in Science)
3. Memorandum to Marcus Rhoades (about the Ds Locus) [Appendix] Publication: Produced: January 1949 Subject(s): GeneticsZea maysMutation Archival Collection: The Barbara McClintock Papers (Profiles in Science)
