1. Letter from Leon A. Heppel to Maxine Singer Publication: Produced: 13 December 1955 Subject(s): PolynucleotidesNucleic Acids Archival Collection: The Maxine Singer Papers (Profiles in Science)
2. Letter from Marianne Grunberg-Manago to Maxine Singer Publication: Produced: [12 October 1958] Subject(s): Polynucleotides Archival Collection: The Maxine Singer Papers (Profiles in Science)
3. Letter from Maxine Singer to Marianne Grunberg-Manago Publication: Produced: 14 October 1959 Subject(s): Polynucleotides Archival Collection: The Maxine Singer Papers (Profiles in Science)
4. Letter from Severo Ochoa to Maxine Singer Publication: Produced: 11 November 1957 Subject(s): PolynucleotidesPolyribonucleotide Nucleotidyltransferase Archival Collection: The Maxine Singer Papers (Profiles in Science)
5. Letter from Leon A. Heppel to Maxine Singer Publication: Produced: [28 December 1957?] Subject(s): Polynucleotides Archival Collection: The Maxine Singer Papers (Profiles in Science)
6. Letter from Severo Ochoa to Maxine Singer Publication: Produced: 24 May 1958 Subject(s): PolynucleotidesPolyribonucleotide Nucleotidyltransferase Archival Collection: The Maxine Singer Papers (Profiles in Science)
7. Letter from Marshall W. Nirenberg to G. Schramm Publication: Produced: 22 November 1961 Subject(s): PolynucleotidesRNA, Messenger Archival Collection: The Marshall W. Nirenberg Papers (Profiles in Science)